我在pgsql中有一个函数。
CREATE OR REPLACE FUNCTION core.date_bs_from_ad(date_in_ad date)
RETURNS character varying AS
$$
BEGIN
RETURN(
SELECT date_in_bs FROM core.date_conversion
WHERE date_in_ad = $1
);
END
$$
LANGUAGE plpgsql;
它没有错误地创建,但是当我使用这个函数时,它会抛出以下错误:
ERROR: column reference "date_in_ad" is ambiguous
LINE 3: WHERE date_in_ad = $1
^
DETAIL: It could refer to either a PL/pgSQL variable or a table column.
QUERY: SELECT (
SELECT MAX(date_in_bs) FROM core.date_conversion
WHERE date_in_ad = $1
)
CONTEXT: PL/pgSQL function core.date_bs_from_ad(date) line 3 at RETURN
********** Error **********
ERROR: column reference "date_in_ad" is ambiguous
SQL state: 42702
Detail: It could refer to either a PL/pgSQL variable or a table column.
Context: PL/pgSQL function core.date_bs_from_ad(date) line 3 at RETURN