create function in postgresql
create [or replace] function function_name(param_list) returns return_type language plpgsql as $$ declare -- variable declaration begin -- logic end; $$
create function in postgresql
create [or replace] function function_name(param_list) returns return_type language plpgsql as $$ declare -- variable declaration begin -- logic end; $$
postgresql functions
CASE WHEN condition_1 THEN result_1 WHEN condition_2 THEN result_2 ... ELSE result_n END
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