Coalesce 是 ANSI 的函数吗 SQL
Is Coalesce a function of ANSI SQL
COALESCE 是 ANSI SQL 电子规范的函数吗?各大关系型数据库是否支持?
是:
https://www.mssqltips.com/sqlservertip/2689/deciding-between-coalesce-and-isnull-in-sql-server/
来自文章:
Some think that you need to use COALESCE because it is the only one that adheres to the ANSI SQL standard.
是的。
是的,COALESCE 由 ISO/ANSI SQL 标准定义。
ISO/ANSI SQL 标准规范 (ISO/IEC 9075-2:2016(E)) 将 CASE
和 COALESCE
列为可选功能:
F261 CASE expression
F261-04 COALESCE
COALESCE 是 ANSI SQL 电子规范的函数吗?各大关系型数据库是否支持?
是:
https://www.mssqltips.com/sqlservertip/2689/deciding-between-coalesce-and-isnull-in-sql-server/
来自文章:
Some think that you need to use COALESCE because it is the only one that adheres to the ANSI SQL standard.
是的。
是的,COALESCE 由 ISO/ANSI SQL 标准定义。
ISO/ANSI SQL 标准规范 (ISO/IEC 9075-2:2016(E)) 将 CASE
和 COALESCE
列为可选功能:
F261 CASE expression
F261-04 COALESCE