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update連線兩個表

1、update 連線兩個表
UPDATE ask_way a
SET way_addr = (
SELECT
q.ans_txt
FROM

pos_ques q
WHERE
a.hos_id = q.hos_id
AND a.way_nam = q.qus_txt 
GROUP BY q.ans_txt
LIMIT 1
)
WHERE
hos_id = '30003000'