sql全连接报语法错误

SELECT sh.dingPackRedeemId,ze.packRedeemId
FROM dingpackredeemlist sh 
FULL JOIN dinguserpacksum ze ON sh.dingPackRedeemId = ze.packRedeemId

[Err] 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 'FULL JOIN dinguserpacksum ze ON sh.dingPackRedeemId = ze.packRedeemId' at line 3

把FULL换成左连接却能执行,这是为什么.?

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