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主题:请问这条语句为什么在orcale9i中说没有右括号

SELECT a.hopper,b.material_id,b.pile_no,b.dosage,c.material_id,c.pile_no,c.dosage,d.material_id,d.pile_no,d.dosage
FROM (((SELECT hopper FROM MIX_CONSUME ORDER BY hopper) AS a LEFT OUTER JOIN (SELECT hopper,material_id,pile_no,dosage FROM MIX_CONSUME WHERE shift=2) AS b ON a.hopper=b.hopper) LEFT OUTER JOIN (SELECT hopper,material_id,pile_no,dosage from MIX_CONSUME where shift=3) AS c ON a.hopper=c.hopper) LEFT OUTER JOIN (SELECT hopper,material_id,pile_no,dosage FROM MIX_CONSUME WHERE shift=1) AS d ON a.hopper=d.hopper

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沙发

我汗.........我很好奇你这条语句是在什么情况下用的....我超级好奇你的er图,我是第一次看到这种left join :SELECT hopper FROM MIX_CONSUME ORDER BY hopper

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