问题描述
支持“=”作为别名而不使用“as”的sql的风味名称是什么时候?
SELECT
A = Col1,B = Col2
FROM Table
相对于 sql-86
SELECT
Col1 AS A,Col2 AS B
FROM Table
解决方法
这对我来说是一个很大的惊喜。似乎 column_alias = 表达式一直是 T-SQL 原始语法的一部分。
将 AS 命令添加到 T-SQL.80 (2000) 以兼容 SQL-92。
SQL2000_release.pdf 第 1459 页的摘录
The AS clause is the syntax defined in the SQL-92 standard for assigning a name to a result set column. This is the preferred
syntax to use in Microsoft® SQL Server™.
column_name AS column_alias
Or
result_column_expression AS derived_column_name
Transact-SQL also supports the following syntax for compatibility with earlier versions of SQL Server:
column_alias = column_name