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db<>fiddle
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item_id name item_group
1 foo 10
2 bar 10
SELECT 2
ERROR:  column "item_id" is of type integer but expression is of type character varying
LINE 2: select * from items where item_id=2;
               ^
HINT:  You will need to rewrite or cast the expression.
INSERT 0 1
INSERT 0 1