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update字段中带select
UPDATE tb_report_type A INNER JOIN (SELECT LEVEL_CODE FROM tb_report_type WHERE id = ‘ED894BE001CE4F47A2916287A491B4E1‘) B
SET A.LEVEL_CODE = CONCAT(B.LEVEL_CODE,‘-‘,A.id) WHERE A.PARENT_ID = ‘ED894BE001CE4F47A2916287A491B4E1‘
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原文地址：http://www.cnblogs.com/xjxz/p/5655460.html
