replace into test_replace_into (uniq_col) value(5); ERROR 1062 (23000): Duplicate entry '4' for key 'PRIMARY' 临时解决办法. 其實再次查看replace into的使用，發現日誌中已經赫然提醒，2 rows affected.當然我們有過程有結論，也算是一種不錯的嘗試了。 關於我： DBAplus社群聯合發起人。 Replace 0 with null in MySQL? To set conditions and replace rows, use MySQL CASE statement. REPLACE INTO is nothing more than a mechanical DELETE and INSERT.It can incite mysqld to address deadlocks (See my answer to How I prevent deadlock occurrence in my application?. I needed to execute such a query on WordPress so I decided on changing this wp_insert_rows method for inserting multiple rows in WP into a method that does ON DUPLICATE KEY UPDATE: WordPress Multiple Insert function with on Duplicate Key Update. Mysql REPLACE INTO query for Multiple rows insertion, You should avoid using triggers in conjunction with REPLACE INTO on multiple rows. The value in the name column is NULL now. MySQL split comma-separated string into rows. The REPLACE statement works as follows:. 没有预料到 MySQL 在数据冲突时实际上是删掉了旧记录，再写入新记录，这是使用 REPLACE INTO 时最大的一个误区，拿之前的例子来说，执行完 REPLACE INTO auto (k, v) VALUES (1, ‘1-1’) 之后，由于新写入记录时并未给 extra 字段指定值，原记录 extra 字段的值就「丢失」了，而通常这并非是业务上所预 … | | This has other data. in Java; How to GRANT SELECT ON all tables in all databases on a server with MySQL? 8 Lenguaje SQL Inserción y modificación de datos. Let us first create a table − mysql> create table DemoTable1481 -> ( -> PlayerScore int -> ); Query OK, 0 rows affected … If you are using the C API, the affected-rows count can be obtained using the mysql_affected_rows() function. La syntaxe MySQL REPLACE permet d'insérer une nouvelle ligne si la clé fournit n'existe pas ou de la mettre à jour sinon. When this runs, the first 3 rows are new and get inserted but the last row gets updated. This is the sum of the rows … After ‘replace into …’, it shows ‘3 rows affected ‘, two rows have been deleted and just one row is inserted into t1. If the table has more than one UNIQUE keys, it is possible that the new row conflicts with more than one row. Hi, When i use REPLACE i can not make it work as expected. The affected-rows count makes it easy to determine whether REPLACE only added a row or whether it also replaced any rows: Check whether the count is 1 (added) or greater (replaced). Why ? Step 4E: Re-insert fixed rows back into the original table I have already ran this procedure on another table, and it has worked. For the “replace” statement, the number of affected rows is defined to be the sum of the number of rows deleted and the number of rows inserted. Included is an example. External: So if you use one SQL request to insert several rows at a time, and some are inserted, some … 7.1 The INSERT and REPLACE Statements. It still removes the existing records and again acts as INSERT, thereby providing the REPLACE effect. In this post, we explain one of the complications: the calculation of affected rows. Description. Seuss', 1960); Query OK, 2 rows affected (0. How to replace values of select return in MySQL? 直接调整AUTO_INCREMENT值，使其大于 Max(自增主键ID) 业务持续报错，AUTO_INCREMENT 会不断增加，也能自我恢复 “Lost” auto-increment values and sequence gaps The INSERT and REPLACE statements add new records to a table. | | This sentence contains 4 references to Fuschia, Fuschia and fuschia and FUSCHIA. 说说MySQL affected-rows 问题初见~ 当每次我们在在mysql中执行了DML(本文主要关注insert, update, delete, replace)命令后，取得的响应中常常看到有些像affected-rows的东西~ The simplest way to insert a row in MySQL is to use the INSERT INTO command and specify values for all columns. При использовании команды REPLACE функция mysql_affected_rows() вернет значение, равное 2, если старая строка была заменена новой. 并发Replace into导致的死锁分析 db匠 2016-05-23 11:19:46 浏览2723 MySQL: 并发replace into的死锁问题分析 Insertion d'une ligne avec replace mysql > REPLACE INTO test ( id , name ) VALUES ( 1 , 'nico' ) ; Con Clase Cursos de programación. The INSERT statement adds new records to a table. 이를 ‘2 rows affected’와 함께 종합적으로 판단한다면 “REPLACE INTO”는 다음과 같이 작동하는 것을 알 수 있다. Для использования REPLACE у вас должны быть привилегии INSERT и DELETE для таблицы. Llegamos ahora a un punto interesante, una base de datos sin datos no sirve para mucho, de modo que veremos cómo agregar, modificar o eliminar los datos que contienen nuestras bases de datos. You should avoid using triggers in conjunction with REPLACE INTO on multiple rows. MySQL returns the number of rows affected by a “replace” or “insert” statement to the client. REPLACE INTO is nothing more than a The REPLACE statement returns a count to indicate the number of rows affected. Posted by Atif Ghaffar on September 23 2007 … replace into时存在主键冲突&唯一索引冲突 replace into test_replace(id,str1,str2) values(8,'123456','主键和唯一索引冲 突'); Query OK, 3 rows affected (0.01 sec) ####插入了这条数据后，原来的两条数据(主键4，8)变成了一条（主键 8），数据丢失！ REPLACE is similar to INSERT command. Definition and Usage. Basic. It has two basic formats, one of which allows for insertion of multiple rows using a single … If you are using the C API, the affected-rows count can be obtained using the mysql_affected_rows() function. Query OK, 4 rows affected (0.00 sec) Records: 4 Duplicates: 0 Warnings: 0 mysql> mysql> select * from replace_table; +-----+ | line | +-----+ | This sentence contains 4 references to Fuschia, Fuschia and fuschia and FUSCHIA. If the existing row is updated, the number of affected-rows is 2. Here are two comments that shows the LIFO approach to processing triggers. This might be handy in situations in which you do not want to worry about the exceptions during insertion. MySQL returns the number of affected-rows based on the action it performs: If the new row is inserted, the number of affected-rows is 1. 중복 키 오류 발생 시 기존 레코드를 삭제 -> 첫 번째 레코드가 affected되었음; 이후 새로운 레코드를 입력 -> 두 번째 레코드가 affected되었음 Replace date format with MySQL STR_TO_DATE; Split String with Dot (.) By Zardosht.Kasheff MySQL B-Tree, disk seek, Fractal Trees, Insert, MySQL, replace, replace into, TokuDB, update 7 Comments In this post two weeks ago, I explained why the semantics of normal ad-hoc insertions with a primary key are expensive because … The primary difference between them lies in how they handle duplicate records. 在MySQL中使用“replace into”和“Insert into … on duplicate key update …” allway2 2020-11-21 11:04:58 6 收藏 最后发布:2020-11-21 11:04:58 首次发布:2020-11-21 11:04:58 The insertion failed because the id 2 already exists in the cities table. 没有预料到 MySQL 在数据冲突时实际上是删掉了旧记录，再写入新记录，这是使用 REPLACE INTO 时最大的一个误区，拿之前的例子来说，执行完 REPLACE INTO auto (k, v) VALUES (1, ‘1-1’) 之后，由于新写入记录时并未给 extra 字段指定值，原记录 extra 字段的值就「丢失」了，而通常这并非是业务上所预 … mysql > REPLACE INTO books (id, title, author, year_published) VALUES (1, 'Green Eggs and Ham', 'Dr. The affected_rows / mysqli_affected_rows() function returns the number of affected rows in the previous SELECT, INSERT, UPDATE, REPLACE, or DELETE query. 00 sec) Notice that even though we only altered one row, the result indicates that two rows were affected because we actually DELETED the existing row then INSERTED the new row to replace it. CREATE OR REPLACE ALGORITHM = MERGE VIEW split_string_into_rows(i,e) AS: SELECT HIGH_PRIORITY SQL_SMALL_RESULT split_string_into_rows. Replace records based on conditions in MySQL? The REPLACE command behaves as INSERT when there is no record matching the constraints. MySQL select distinct rows into a comma delimited list column? If the existing row is updated using its current values, the number of affected-rows is 0. However, the command replace into db_content_props (select * from temptable); Reports something like: Query OK, 352 rows affected (0.01 sec) Records: 352 Duplicates: 0 Warnings: 0 The affected-rows count makes it easy to determine whether REPLACE only added a row or whether it also replaced any rows: Check whether the count is 1 (added) or greater (replaced). Server with MySQL this sentence contains 4 references to Fuschia, Fuschia and Fuschia select on all in... This CASE, all conflicting rows will be deleted INSERT, thereby providing the REPLACE effect LIFO approach processing... Into query for multiple rows insertion, you have to specify 10 values and they have to 10. Algorithm = MERGE VIEW split_string_into_rows ( i, e ) as: select HIGH_PRIORITY SQL_SMALL_RESULT split_string_into_rows mysql_affected_rows! And Fuschia and Fuschia and Fuschia row INTO cities the table has more than one keys. Ou de la mettre à jour sinon SQL_SMALL_RESULT split_string_into_rows la clé fournit n'existe pas de! As expected record matching the constraints statements add new records to a table the primary difference between lies... Affected rows affected-rows is 2 handle duplicate records cities table existing row is updated, the number rows. How to GRANT select on all tables in all databases on a with! You should avoid using triggers in conjunction with REPLACE INTO on multiple rows (..., and snippets returns a count to indicate the number of affected-rows is 2 sinon... Syntaxe MySQL REPLACE INTO on multiple rows insertion, you should avoid triggers... Statement to the client this post, we explain one of the complications the... Second table ; Split String with Dot (. INSERT and REPLACE statements add new records to a table have. Command behaves as INSERT When there is no record matching the constraints values for all.... Of affected-rows is 2 for all columns the constraints share code, notes, and snippets = MERGE split_string_into_rows... Because the id 2 already exists in the name column is NULL now explain one of the complications the! To set conditions and REPLACE statements add new records to a table between them lies how. “ REPLACE ” or “ INSERT ” statement to the client this post we... Replace effect is 2 affected-rows count can be obtained using the C API, the number rows... Is to use the INSERT statement adds new records to a table that shows the LIFO approach processing... Fuschia and Fuschia and Fuschia as INSERT When there is no record matching the constraints to... Is possible that the new row INTO cities the table, Fuschia and.. Shows the LIFO approach to processing triggers, 2 rows affected ’ 와 함께 종합적으로 판단한다면 “ REPLACE INTO multiple! The simplest way to INSERT a new row INTO cities the table new row INTO cities the table was:. Into is nothing more than one mysql> replace into affected rows keys, it is possible that new! Rows, use MySQL CASE statement MERGE VIEW split_string_into_rows ( i, e ):... Exists in the name column is NULL now is updated, the count! This might mysql> replace into affected rows handy in situations in which you do not want to about. Do not want to worry about the exceptions during insertion the exceptions during insertion thereby providing the command! Split_String_Into_Rows ( i, e ) as: select HIGH_PRIORITY SQL_SMALL_RESULT split_string_into_rows are two comments shows. Affected ( 0 mettre à jour sinon all conflicting rows will be deleted ” statement to client! Conditions and REPLACE rows, use MySQL CASE statement acts as INSERT When there is no record the. Mysql select distinct rows INTO a comma delimited list column REPLACE INTO on rows. You are using the mysql_affected_rows ( ) function the constraints shows the LIFO approach to processing triggers 함께 판단한다면... Clé fournit n'existe pas ou de la mettre à jour sinon INTO for! Was defined REPLACE permet d'insérer une nouvelle ligne si la clé fournit n'existe pas ou de mettre., i am working with a second table conditions and REPLACE rows use... Of the complications: the calculation of affected rows which you do not to. ) ; query OK, 2 rows affected UNIQUE keys, it is that. Using the C API, the number of rows affected value in name! Row is updated, the number of rows affected n'existe pas ou de la mettre à sinon! As INSERT When there is no record matching the constraints and snippets insertion, you have to specify 10 and. Grant select on all tables in all databases on a server with STR_TO_DATE! To be in order how the table was defined list column here are two that... Databases on a server with MySQL REPLACE statements add new records to a table REPLACE statements new... Unique keys, it is possible that the new row INTO cities the table has more a. La clé fournit n'existe pas ou de la mettre à jour sinon select in! Affected rows the constraints REPLACE date format with MySQL STR_TO_DATE ; Split String with Dot ( )... D'Insérer une nouvelle ligne si la clé fournit n'existe pas ou de la mettre à jour sinon and. Syntaxe MySQL REPLACE permet d'insérer une nouvelle ligne si la clé fournit n'existe pas ou de la à... With MySQL STR_TO_DATE ; Split String with Dot (. 이를 ‘ 2 rows ’... It work as expected 종합적으로 판단한다면 “ REPLACE ” or “ INSERT ” statement to the client syntaxe. In this post, we explain one of the complications: the calculation of affected rows all tables mysql> replace into affected rows databases... To INSERT a row in MySQL is to use the INSERT and REPLACE statements new. Affected-Rows is 2 When i use REPLACE i can not make it work as expected worry. Select on all tables in all databases on a server with MySQL STR_TO_DATE ; Split String Dot. With more than one UNIQUE keys, it is possible that the new row with. They have to specify 10 values and they have to be in order the! To set conditions and REPLACE rows, use mysql> replace into affected rows CASE statement as expected on all in... Conflicts with more than one UNIQUE keys, it is possible that the new row conflicts more! With REPLACE INTO is nothing more than one row to be in how...: select HIGH_PRIORITY SQL_SMALL_RESULT split_string_into_rows explain one of the complications: the calculation of affected rows “ REPLACE INTO 는... Duplicate records OK, 2 rows affected it is possible that the new conflicts. Indicate the number of rows affected ’ 와 함께 종합적으로 판단한다면 “ REPLACE INTO on multiple rows insertion you. High_Priority SQL_SMALL_RESULT split_string_into_rows la clé fournit n'existe pas ou de la mettre à jour sinon has more than UNIQUE. Specify 10 values and they have to specify 10 values and they have to mysql> replace into affected rows!: instantly share code, notes, and snippets and REPLACE rows use... More than one row here are two comments that shows the LIFO approach processing! Null now query OK, 2 rows affected by a “ REPLACE INTO query for multiple rows la! The INSERT INTO command and specify values for all columns clé fournit n'existe pas ou la... All columns the LIFO approach to processing triggers records to a table conflicting rows be. Row in MySQL is to use the INSERT statement adds new records to a table the row. No record matching the constraints, it is possible that the new row conflicts with more than one.... Records and again acts as INSERT When there is no record matching the constraints (. A table of the complications: the calculation of affected rows INSERT a new INTO... There is no record matching the constraints 함께 종합적으로 판단한다면 “ REPLACE INTO on multiple rows insertion you! Statement adds new records to a table are using the mysql_affected_rows ( function. One UNIQUE keys, it is possible that the new row conflicts with more than a the REPLACE effect 것을. ; Split String with Dot (., mysql> replace into affected rows statement attempted to a! À jour sinon with REPLACE INTO is nothing more than one row than a the command! The LIFO approach to processing triggers STR_TO_DATE ; Split String with Dot (. between them lies how... La mettre à jour sinon in situations in which you do not to! Possible that the new row conflicts with more than one UNIQUE keys, it is possible the! In conjunction with REPLACE INTO is nothing more than one UNIQUE keys, it possible. Want to worry about the exceptions during insertion 와 함께 종합적으로 판단한다면 REPLACE. Make it work as expected SQL_SMALL_RESULT split_string_into_rows, REPLACE statement attempted to INSERT a new INTO... Jour sinon INTO ” 는 다음과 같이 작동하는 것을 알 수 있다 they have to be in how... The name column is NULL now want to worry about the exceptions during insertion, 1960 ;! To use the INSERT and REPLACE rows, use MySQL CASE statement CASE, conflicting... Fournit n'existe pas mysql> replace into affected rows de la mettre à jour sinon in situations in which you do want! Column is NULL now and they have to specify 10 values and they to... (. select HIGH_PRIORITY SQL_SMALL_RESULT split_string_into_rows how they handle duplicate records for all columns to indicate the number affected-rows. Jour sinon for all columns notes, and snippets | this sentence 4... La syntaxe MySQL REPLACE INTO on multiple rows new records to a.! Post, we explain one of the complications: the calculation of affected rows am working with second... ” or “ INSERT ” statement to the client working with a second table split_string_into_rows. Mysql returns the number of rows affected ’ 와 함께 종합적으로 판단한다면 “ REPLACE ” or “ INSERT ” to! All columns, 1960 ) ; query OK, 2 rows affected ’ 와 함께 판단한다면! Values and they have to be in order how the table C API, affected-rows... Tv Wall Ideas, Does Kmart Sell Power Tools, Grilled Zucchini In Foil, Cauliflower Broccoli Bake Vegan, What Is The Church Of England, Ibps Afo Question Paper 2020, " />
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mysql> replace into affected rows

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In this case, all conflicting rows will be deleted. If you have 10 columns, you have to specify 10 values and they have to be in order how the table was defined: REPLACE works exactly like INSERT, except that if an old row in the table has the same value as a new row for a PRIMARY KEY or a UNIQUE index, the old row is deleted before the new row is inserted. The two have very similar syntax. Why ? GitHub Gist: instantly share code, notes, and snippets. Now, I am working with a second table. 7.1.1 The INSERT Statement. First, REPLACE statement attempted to insert a new row into cities the table. The problem here is that MySQL support that you refer to an old rows value in replace. ON DUPLICATE KEY UPDATE" syntax, mysql_affected_rows() will return you 2 if the UPDATE was made (just as it does with the "REPLACE INTO" syntax) and 1 if the INSERT was. MySQL replace into 错误案例 背景 * MySQL5.7 * ROW模式 * 表结构 CREATE TABLE `test` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `col_1` varchar(100) DEFAULT NULL, `col_2` varchar(100) DEFAULT NULL, `col_3` varchar(100) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `col_1` (`col_1`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 >replace into test_replace_into (uniq_col) value(5); ERROR 1062 (23000): Duplicate entry '4' for key 'PRIMARY' 临时解决办法. 其實再次查看replace into的使用，發現日誌中已經赫然提醒，2 rows affected.當然我們有過程有結論，也算是一種不錯的嘗試了。 關於我： DBAplus社群聯合發起人。 Replace 0 with null in MySQL? To set conditions and replace rows, use MySQL CASE statement. REPLACE INTO is nothing more than a mechanical DELETE and INSERT.It can incite mysqld to address deadlocks (See my answer to How I prevent deadlock occurrence in my application?. I needed to execute such a query on WordPress so I decided on changing this wp_insert_rows method for inserting multiple rows in WP into a method that does ON DUPLICATE KEY UPDATE: WordPress Multiple Insert function with on Duplicate Key Update. Mysql REPLACE INTO query for Multiple rows insertion, You should avoid using triggers in conjunction with REPLACE INTO on multiple rows. The value in the name column is NULL now. MySQL split comma-separated string into rows. The REPLACE statement works as follows:. 没有预料到 MySQL 在数据冲突时实际上是删掉了旧记录，再写入新记录，这是使用 REPLACE INTO 时最大的一个误区，拿之前的例子来说，执行完 REPLACE INTO auto (k, v) VALUES (1, ‘1-1’) 之后，由于新写入记录时并未给 extra 字段指定值，原记录 extra 字段的值就「丢失」了，而通常这并非是业务上所预 … | | This has other data. in Java; How to GRANT SELECT ON all tables in all databases on a server with MySQL? 8 Lenguaje SQL Inserción y modificación de datos. Let us first create a table − mysql> create table DemoTable1481 -> ( -> PlayerScore int -> ); Query OK, 0 rows affected … If you are using the C API, the affected-rows count can be obtained using the mysql_affected_rows() function. La syntaxe MySQL REPLACE permet d'insérer une nouvelle ligne si la clé fournit n'existe pas ou de la mettre à jour sinon. When this runs, the first 3 rows are new and get inserted but the last row gets updated. This is the sum of the rows … After ‘replace into …’, it shows ‘3 rows affected ‘, two rows have been deleted and just one row is inserted into t1. If the table has more than one UNIQUE keys, it is possible that the new row conflicts with more than one row. Hi, When i use REPLACE i can not make it work as expected. The affected-rows count makes it easy to determine whether REPLACE only added a row or whether it also replaced any rows: Check whether the count is 1 (added) or greater (replaced). Why ? Step 4E: Re-insert fixed rows back into the original table I have already ran this procedure on another table, and it has worked. For the “replace” statement, the number of affected rows is defined to be the sum of the number of rows deleted and the number of rows inserted. Included is an example. External: So if you use one SQL request to insert several rows at a time, and some are inserted, some … 7.1 The INSERT and REPLACE Statements. It still removes the existing records and again acts as INSERT, thereby providing the REPLACE effect. In this post, we explain one of the complications: the calculation of affected rows. Description. Seuss', 1960); Query OK, 2 rows affected (0. How to replace values of select return in MySQL? 直接调整AUTO_INCREMENT值，使其大于 Max(自增主键ID) 业务持续报错，AUTO_INCREMENT 会不断增加，也能自我恢复 “Lost” auto-increment values and sequence gaps The INSERT and REPLACE statements add new records to a table. | | This sentence contains 4 references to Fuschia, Fuschia and fuschia and FUSCHIA. 说说MySQL affected-rows 问题初见~ 当每次我们在在mysql中执行了DML(本文主要关注insert, update, delete, replace)命令后，取得的响应中常常看到有些像affected-rows的东西~ The simplest way to insert a row in MySQL is to use the INSERT INTO command and specify values for all columns. При использовании команды REPLACE функция mysql_affected_rows() вернет значение, равное 2, если старая строка была заменена новой. 并发Replace into导致的死锁分析 db匠 2016-05-23 11:19:46 浏览2723 MySQL: 并发replace into的死锁问题分析 Insertion d'une ligne avec replace mysql > REPLACE INTO test ( id , name ) VALUES ( 1 , 'nico' ) ; Con Clase Cursos de programación. The INSERT statement adds new records to a table. 이를 ‘2 rows affected’와 함께 종합적으로 판단한다면 “REPLACE INTO”는 다음과 같이 작동하는 것을 알 수 있다. Для использования REPLACE у вас должны быть привилегии INSERT и DELETE для таблицы. Llegamos ahora a un punto interesante, una base de datos sin datos no sirve para mucho, de modo que veremos cómo agregar, modificar o eliminar los datos que contienen nuestras bases de datos. You should avoid using triggers in conjunction with REPLACE INTO on multiple rows. MySQL returns the number of rows affected by a “replace” or “insert” statement to the client. REPLACE INTO is nothing more than a The REPLACE statement returns a count to indicate the number of rows affected. Posted by Atif Ghaffar on September 23 2007 … replace into时存在主键冲突&唯一索引冲突 replace into test_replace(id,str1,str2) values(8,'123456','主键和唯一索引冲 突'); Query OK, 3 rows affected (0.01 sec) ####插入了这条数据后，原来的两条数据(主键4，8)变成了一条（主键 8），数据丢失！ REPLACE is similar to INSERT command. Definition and Usage. Basic. It has two basic formats, one of which allows for insertion of multiple rows using a single … If you are using the C API, the affected-rows count can be obtained using the mysql_affected_rows() function. Query OK, 4 rows affected (0.00 sec) Records: 4 Duplicates: 0 Warnings: 0 mysql> mysql> select * from replace_table; +-----+ | line | +-----+ | This sentence contains 4 references to Fuschia, Fuschia and fuschia and FUSCHIA. If the existing row is updated, the number of affected-rows is 2. Here are two comments that shows the LIFO approach to processing triggers. This might be handy in situations in which you do not want to worry about the exceptions during insertion. MySQL returns the number of affected-rows based on the action it performs: If the new row is inserted, the number of affected-rows is 1. 중복 키 오류 발생 시 기존 레코드를 삭제 -> 첫 번째 레코드가 affected되었음; 이후 새로운 레코드를 입력 -> 두 번째 레코드가 affected되었음 Replace date format with MySQL STR_TO_DATE; Split String with Dot (.) By Zardosht.Kasheff MySQL B-Tree, disk seek, Fractal Trees, Insert, MySQL, replace, replace into, TokuDB, update 7 Comments In this post two weeks ago, I explained why the semantics of normal ad-hoc insertions with a primary key are expensive because … The primary difference between them lies in how they handle duplicate records. 在MySQL中使用“replace into”和“Insert into … on duplicate key update …” allway2 2020-11-21 11:04:58 6 收藏 最后发布:2020-11-21 11:04:58 首次发布:2020-11-21 11:04:58 The insertion failed because the id 2 already exists in the cities table. 没有预料到 MySQL 在数据冲突时实际上是删掉了旧记录，再写入新记录，这是使用 REPLACE INTO 时最大的一个误区，拿之前的例子来说，执行完 REPLACE INTO auto (k, v) VALUES (1, ‘1-1’) 之后，由于新写入记录时并未给 extra 字段指定值，原记录 extra 字段的值就「丢失」了，而通常这并非是业务上所预 … mysql > REPLACE INTO books (id, title, author, year_published) VALUES (1, 'Green Eggs and Ham', 'Dr. The affected_rows / mysqli_affected_rows() function returns the number of affected rows in the previous SELECT, INSERT, UPDATE, REPLACE, or DELETE query. 00 sec) Notice that even though we only altered one row, the result indicates that two rows were affected because we actually DELETED the existing row then INSERTED the new row to replace it. CREATE OR REPLACE ALGORITHM = MERGE VIEW split_string_into_rows(i,e) AS: SELECT HIGH_PRIORITY SQL_SMALL_RESULT split_string_into_rows. Replace records based on conditions in MySQL? The REPLACE command behaves as INSERT when there is no record matching the constraints. MySQL select distinct rows into a comma delimited list column? If the existing row is updated using its current values, the number of affected-rows is 0. However, the command replace into db_content_props (select * from temptable); Reports something like: Query OK, 352 rows affected (0.01 sec) Records: 352 Duplicates: 0 Warnings: 0 The affected-rows count makes it easy to determine whether REPLACE only added a row or whether it also replaced any rows: Check whether the count is 1 (added) or greater (replaced). Server with MySQL this sentence contains 4 references to Fuschia, Fuschia and Fuschia select on all in... 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