MySQL 更新语句语法错误

Question

我有当前的代码，

UPDATE i
SET LeadInventor = 
    CASE 
        WHEN gs.FirstInventorName IS NULL THEN 'No' 
        ELSE 'Yes' 
    END
FROM patentdb.Inventor i
    LEFT JOIN patentdb.generalsource gs
    ON i.InventorFirst + ' ' + i.InventorLast = gs.FirstInventorName

我不明白为什么它会抛出以下错误:

Error Code: 1064. You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'FROM patentdb.Inventor i     LEFT JOIN patentdb.generalsource gs     ON i.Invent' at line 7

FROM语句是MYSQL所强调的

Answer 1

这是因为 FROM 子句在 MySQL UPDATE 语句中无效:

http://dev.mysql.com/doc/refman/5.6/en/update.html

你可能会有更好的运气:

UPDATE Inventor i, generalsource gs
SET i.LeadInventor = CASE
  WHEN gs.FirstInventorName IS NULL THEN 'No'
  ELSE 'Yes'
END
WHERE i.InventorFirst + ' ' + i.InventorLast = gs.FirstInventorName