接下来,试一下STATEMENT的触发 第一步、建立个针对触发器的存储(方法)过程 CREATEORREPLACEFUNCTIONpublic.func_test_clone_stat()RETURNStriggerLANGUAGEplpgsqlAS$function$beginif(TG_OP='INSERT')THENinsertinto"test_clone"select*from
DELETE FROM employee WHERE id = 100; To delete all the rows from the employee table, the query would be like, DELETE FROM employee; SQL TRUNCATE StatementThe SQL TRUNCATE command is used to delete all the rows from the table and free the space containing the table....
1、Row(5.7默认)。记录被修改后的行记录。缺点是占空间大。优点是能保证数据安全,不会发生遗漏。 2、Statement。记录修改的 sql。缺点是在 mysql 集群时可能会导致操作不一致从而使得数据不一致(比如在操作中加入了Now()函数,主从数据库操作的时间不同结果也不同)。优点是占空间小,执行快。 3、Mixed。会针对于...
The right application of the DELETE statement for data removal is crucial, and it involves lots of issues. Still, there are standard practices of the DELETE statement usage that simplify all such tasks. This article will explore some of the professional life scenarios to equip you with the most...
These SQL delete statements delete all the table’s data. Usually, we do not remove all the rows from a SQL table. To remove a specific row, we can add a where clause with the delete statement. The where clause contains the filter criteria and eventually determines which row(s) to remov...
The DELETE statement is used to delete rows in a table. DELETE 声明常用来删除表中的数据。 语法 DELETE FROM table_nameWHERE column_name = some_value --- Person: LastName FirstName Address City Nilsen Fred Kirkegt 56 Stavanger Rasmussen Nina Stien 12 Stavanger --- Delete...
http://dev.mysql.com/doc/refman/8.0/en/with.html.Single-TableSyntaxDELETE[LOW_PRIORITY][QUICK][IGNORE]FROMtbl_name[PARTITION (partition_name [, partition_name]...)][WHERE where_condition][ORDER BY ...][LIMIT row_count]TheDELETEstatement deletes rowsfromtbl_nameandreturnsthenumberofdeleted ...
1 row(s) deleted. Here’s what the table will look like after the row is deleted: Delete Multiple Rows in SQL What if you want to delete multiple rows? Let’s say we wanted to delete all rows where the category is Office. Our statement would look similar: ...
s tStatement = ##class(%SQL.Statement).%New(0,"Sample") s qStatus = tStatement.%Prepare(sqltext) if qStatus'=1 { w "%Prepare failed:" d $System.Status.DisplayError(qStatus) q } s rtn = tStatement.%Execute("Fr") if rtn.%SQLCODE=0 { w !,"Delete succeeded" w !,"Row ...
如果指定了 COMMIT (*NONE) ,那么已删除的任何行不会恢复为其先前的值。 如果SQL 找不到满足搜索条件的任何行,那么将返回 SQLCODE +100。 注:DELETE 语句可能已删除多行。 删除的行数反映在 SQLCA 的 SQLERRD (3) 中。 此值也可从 GET DIAGNOSTICS 语句中的 ROW_COUNT 诊断项获取。