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conditional instructions
At PL/pgSQL there are few conditional instructions.IF_THEN_ELSE
IF condition THEN instruction1
[ELSE instruction2] END IF;
If condition is met there will be executed instruction1. Otherwise there will be executed instruction2 if there is specified ELSE block.
CASE
CASE WHEN condition THEN expression
[ WHEN condition2 THEN expression2 ]
[ ELSE expression ]
END;
Depending on which condition is met first, that will be returned value of the expression
NULLIF
NULLIF( input, value );
This instruction will return NULL value if input = value
Otherwise there will be returned value value.
Depending on which condition is met first that will be returned value of the expression.
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