Coalesce Example SQL - 搜索视频

PL/SQL Coalesce - Oracle PL/SQL Tutorial

PL/SQL Coalesce - Oracle PL/SQL Tutorial

The COALESCE function returns the first non null expression in the expression list. COALESCE syntax COALESCE( expr_1, expr_2, expr_n ) COALESCE example select COALESCE(null,'1') from dual; Result: 1 select COALESCE(null, 2) from dual; Result: 2 select COALESCE(null, null, 3) from dual; Result: 3 select COALESCE(null, null, null, 4) from dual ...

2017年9月15日

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