3. 如果CTE的表达式名称与某个数据表或视图重名,则紧跟在该CTE后面的SQL语句使用的仍然是CTE,当然,后面的SQL语句使用的就是数据表或视图了,如下面的SQL语句所示: -- table1是一个实际存在的表 with table1 as ( select * from persons where age < 30 ) select * from table1 -- 使用了名为table1的公...
YouTube – SQL WITH Clause | How to write SQL Queries using WITH Clause | SQL CTE (Common Table Expression) 特色 1. CTE 可以引用自身, 实现递归查询. (Oracle 用 connect by prior) 2. 它有点像表变量, 其后的 query 都可以引用它. 然后自动销毁. 很方便 3. 可读性很棒 复用与可读性优化 来看...
Specifies a temporary named result set, known as a common table expression (CTE). This is derived from a simple query and defined within the execution scope of a single SELECT, INSERT, UPDATE, MERGE, or DELETE statement. This clause can also be used in a CREATE VIEW statement as part of...
Transact-SQL syntax conventionsSyntaxsyntaxsql העתק [ WITH <common_table_expression> [ ,...n ] ] <common_table_expression>::= expression_name [ ( column_name [ ,...n ] ) ] AS ( CTE_query_definition ) הערה To view Transact-SQL syntax for SQL Server 2014 (...
A common table expression (CTE) can be thought of as a temporary result set that is defined within the execution scope of a single SELECT, INSERT, UPDATE, DELETE, or CREATE VIEW statement. A CTE is similar to a derived table in that it is not stored as an object and lasts only for ...
Transact-SQL 语法约定 语法 复制 [ WITH <common_table_expression> [ ,...n ] ] <common_table_expression>::= expression_name [ (column_name [ ,...n ] ) ] AS (CTE_query_definition) 参数 expression_name 公用表表达式的有效标识符。 expression_name 必须与在同一 WITH <common_table_expres...
Transact-SQL 语法约定 语法 复制 [ WITH <common_table_expression> [ ,...n ] ] <common_table_expression>::= expression_name [ (column_name [ ,...n ] ) ] AS (CTE_query_definition) 参数 expression_name 公用表表达式的有效标识符。 expression_name 必须与在同一 WITH <common_table_expres...
WITH common_table_expression (Transact-SQL) 数据类型 (Transact-SQL) EXECUTE 表达式(Transact-SQL) 语言元素 (Transact-SQL) 管理命令 运算符 (Transact-SQL) 谓词(Transact-SQL) PRINT (Transact-SQL) RAISERROR 安全语句 Service Broker 语句 SET (Transact-SQL) ...
SQL database in Microsoft Fabric Specifies a temporary named result set, known as a common table expression (CTE). This is derived from a simple query and defined within the execution scope of a single SELECT, INSERT, UPDATE, DELETE, or MERGE statement. This clause can also be used in a...
What is a SQL CTE or Common Table Expression in SQL Server? A SQL CTE (Common Table Expression) defines a temporary result set which you can then use in a SELECT statement. It becomes a convenient way to manage complicated queries.