写成这样差不多了吧?SELECT *
FROM (tab1 LEFT OUTER JOIN tab2 ON tab1.c3 = tab2.c3)
RIGHT OUTER JOIN
(tab3 LEFT OUTER JOIN tab4 ON tab3.c1 = tab4.c1)
ON tab2.c3 = tab4.c3
FROM (tab1 LEFT OUTER JOIN tab2 ON tab1.c3 = tab2.c3)
RIGHT OUTER JOIN
(tab3 LEFT OUTER JOIN tab4 ON tab3.c1 = tab4.c1)
ON tab2.c3 = tab4.c3
解决方案 »
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