使用APPLY UPDATE some_table SET some_row = another_row, some_row2 = another_row/2 FROM some_table st CROSS APPLY (SELECT TOP 1 another_row FROM another_table at WHERE at.shared_id=st.shared_id) WHERE ... Run Code Online (Sandbox Code Playgroud) 在更新语句中使用交叉应用归档...
SQL Server 将PL/SQL查询转换为T-SQL，T-SQL通过select将行的值复制到另一行不幸的是，UPDATE语句在...
语法:UPDATE 表名称 SET 列名称 = 新值 WHERE 列名称 = 某值 3、DELETE 语句:用于删除表中的行。 语法:DELETE FROM 表名称 WHERE 列名称 = 值 4、SELECT 语句:用于从表中选取数据。 语法:SELECT 列名称 FROM 表名称版权声明:本文为wwwwerewrew原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链...
SELECT TOP (select count(*) cn from anotherTable where 0 = 0) cols FROM tableName where 0 = 0 ORDER BY col。 还有一点就是在sql server2005中可以在delete或者update中使用top了,不过感觉这个功能不会很常用。
甚至使用子查询确定要去的条数: SELECT TOP (select count(*) cn from anotherTable where 0 = 0) cols FROM tableName where 0 = 0 ORDER BY col。 还有一点就是在sql server2005中可以在delete或者update中使用top了,不过感觉这个功能不会很常用。
删除现有数据(使用 DELETE FROM): DELETE FROM your_table; 注意:这会逐行删除数据,并记录每行的删除操作,因此可能比 TRUNCATE TABLE 更慢,并且会触发 DELETE 触发器。 插入新数据(与方法一相同)。 方法三:使用带有 ON DUPLICATE KEY UPDATE 的INSERT(适用于MySQL) 如果你的表中定义了唯一键或主键,你可以使用...
To attach to a database on another server, you use a linked server. Similar to an alias, a synonym is used to specify an object (like a table) inSQL. You still need the linked server even if you allow a synonym to point to one of its objects. ...
Joins in T-SQL are clauses used to combine rows from two or more tables, based on a related column between them. Joins specify how SQL should use data from one table to select the rows in another table. Several operators -- such as =, <, >, <>, <=, >=, !=, BETWEEN, LIKE,...
You can manage additional logic such as deleting rows from the target that don’t appear in the source. For simple, straightforward updates of data in one table based on data in another, it is typically more efficient to use simple INSERT, DELETE, and UPDATE st...
Insert Delete Update Update UPDATE <modified_table> SET col1 = <new_value>[, col2 = <new_value>] [FROM <modified_table> <join_type> JOIN <another_table> ON <join_condition>] WHERE <search_condition>] 2.5.Update 2.5.1.The syntax of the UPDATE statement ...