表关联更新:
UPDATE user_bank a INNER JOIN bank AS b
ON a.bank_code = b.bank_code
SET a.bank_type =b.id WHERE a.bank_type IS NULL AND a.id=1650;
更新前的查询：
select * from user_bank where id = 1650;
select * from user_bank where bank_type is null;
select count(*) from user_bank where bank_type is null;
select * from bank;
select * from bank where bank_code = '03010000';
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