计算input_expression,然后按指定顺序对每个 WHEN 子句的 input_expression = when_expression 进行计算。 返回第一个取值为 TRUE 的 (input_expression = when_expression) 的 result_expression。 如果没有取值为 TRUE 的 input_expression = when_expression,则当指定 ELSE 子句时 SQL Server 将返回 else_result_...
You may find theMySQL User Forumshelpful when working with triggers. For answers to commonly asked questions regarding triggers in MySQL, seeSection A.5, “MySQL 8.4 FAQ: Triggers”. There are some restrictions on the use of triggers; seeSection 27.8, “Restrictions on Stored Programs”. ...
The trigger can be executed when you run one of the following MySQL statements on the table: INSERT, UPDATE and DELETE and it can be invoked before or
CREATETRIGGERtrigger_ name # the trigger name{BEFORE|AFTER}# when the trigger activates{INSERT|UPDATE|DELETE}# what statement activates itONtbl_ name # the associated tableFOREACHROWtrigger_ stmt;# what the trigger does 来个栗子看看: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 CREATETABLE...
192.168.2.128 [root ~]$ mysqldump -uroot -p123456 --master-data=2 --single-transaction -R --triggers -A > all.sql 其中--master-data=2代表备份时刻记录master的Binlog位置和Position,--single-transaction意思是获取一致性快照,-R意思是备份存储过程和函数,--triggres的意思是备份触发器,-A代表备份所...
you can also change its value withSET NEW.col_name=valueif you have theUPDATEprivilege for it. This means you can use a trigger to modify the values to be inserted into a new row or used to update a row. (Such aSETstatement has no effect in anAFTERtrigger because the row change wil...
create trigger trigger_name {before | after} {insert | update | delete} on tabl_name for each row trigger_stmt 上述语法说明: (1)trigger_name:触发器名称。 (2)before | after:触发程序的动作时间,在触发事件之前还是之后触发语句。 (3)insert | update | delete:触发条件。
how to use a triggerPosted by: William Won Date: November 26, 2006 06:40PM Hi, was wondering if triggers would be able to do this. I wanted to create a trigger that occurs when a field is updated to a certain value. After that field has been updated, I would like to delete ...
CREATE TEMPORARY TABLE and DROP TEMPORARY TABLE statements are not supported inside transactions, procedures, functions, and triggers when using GTIDs (that is, when the enforce_gtid_consistency system variable is set to ON). It is possible to use these statements with GTIDs enabled, but only ...
Documented bugfix in the 5.1.39 changelog as follows: Performing a multi-row update of the AUTO_INCREMENT column of a transactional table could result in an inconsistency between master and slave when there was a trigger on the transactional table that updated a non-transactional table. When suc...