sql server cross/outer apply 用法

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sql server cross/outer apply 用法

这是 sql server 帮助文档关于apply的描述: 使用 APPLY 运算符(2005或以上版本)可以为实现查询操作的外部表表达式返回的每个行调用表值函数.表值函数作为右输入,外部表表达式作为左输入.通过对右输入求值来获得左输入每一行的计算结果,生成的行被组合起来作为最终输出.APPLY 运算符生成的列的列表是左输入中的列集,后跟右输入返回的列的列表. APPLY 有两种形式: CROSS APPLY 和 OUTER APPLY.CROSS APPLY 仅返回外部表中通过表值函数生成结果…

SQL Server Cross/Outer Apply

SQL Server2005引入了APPLY运算符,它非常像连接子句,它允许两个表达式直接进行连接,即将左/外部表达式和右/内部表达式连接起来. CROSS APPLY(类比inner join)和OUTER APPLY (类比left out join) APPLY 是微软对SQL扩展,最初是为了和表值函数一起使用.…

SQL语句 - MERGE INTO 、Cross/Outer Apply用法理解

MERGE INTO 语法: MERGE INTO table_name alias1 USING (table|view|sub_query) alias2ON (join condition) WHEN MATCHED THEN UPDATE table_name SET col1 = col_val1, col2 = col2_val WHEN NOT MATCHED THEN INSERT (column_list) VALUES (column_values);…

<转>SQL Server CROSS APPLY and OUTER APPLY

Problem SQL Server 2005 introduced the APPLY operator, which is like a join clause and it allows joining between two table expressions i.e. joining a left/outer table expression with a right/inner table expression. The difference between the join and…

SQL SERVER 中 GO 的用法2

具体不废话了,请看下文详解. 1 2 3 4 5 6 7 8 9 10 use db_CSharp go select *, 备注=case when Grade>=90 then '成绩优秀' when Grade<90 and Grade>=80 then '成绩良好' when Grade<80 and Grade>=70 then '成绩及格' else '不及格' end from tb_Grade 如果只是执行一条语句,有没有GO都一样如果多条语…

Sql Server cross apply和outer apply

with result as( select t.str from( ' str union all ' str union all ' str union all ' str union all ' str union all ' str union all ' str ) t cross apply (select t2.str from( ' str union all ' str union all ' str union all ' str ) t2 where t.str = t2.…