The COALESCE function returns first not null expression among the arguments. Minimum 2 arguments required.
If all expressions are null then it returns null.
Syntax:-
COALESCE (expr_1,expr_2,…expr_n)
Examples :-
1. select COALESCE(null,null,null,10) from dual;
would return 10.
2. select COALESCE(null,null,null) from dual;
would return null.
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