解決MySQL報錯[Err] 1093 - You can't specify target...

做數據變更的時候經常遇到這樣的報錯

DELETE
FROM
	ssq_contract_record
WHERE
	LOAN_ID IN (
		SELECT
			ssq_contract_record.LOAN_ID
		FROM
			ssq_contract_record
		LEFT JOIN loan_info ON ssq_contract_record.LOAN_ID = loan_info.ID
		WHERE
			ssq_contract_record.CREATE_TIME > '2018-10-30 00:00:00'
		AND ssq_contract_record.CREATE_TIME < '2018-11-14 00:00:00'
		AND loan_info.LENDING_TAG = 'SINAP2P'
	);

[Err] 1093 - You can't specify target table 'XXX' for update in FROM clause

報錯的意思是 你不能在update這張表的同時在from的子查詢中出現這張表 

解決辦法很簡單，外面再加一層查詢“騙過”MySQL，

改寫如下

DELETE
FROM
	ssq_contract_record
WHERE
	LOAN_ID IN (
		SELECT
			t.loan_Id
		FROM
			(
				SELECT
					ssq_contract_record.LOAN_ID
				FROM
					ssq_contract_record
				LEFT JOIN loan_info ON ssq_contract_record.LOAN_ID = loan_info.ID
				WHERE
					ssq_contract_record.CREATE_TIME > '2018-10-30 00:00:00'
				AND ssq_contract_record.CREATE_TIME < '2018-11-14 00:00:00'
				AND loan_info.LENDING_TAG = 'SINAP2P'
			) t
	);

問題解決!