SQL ??? INNER JOIN 'OR' ??? ??? ??: ?? ??
?? SQL Server 2008 ??? ?? ?? ??? OR ?? INNER JOIN ???? ?? ??????. ? ?? ???(?? 50,000?? ?? ??)? ??? ?? ??? ??? ?? ??? ?????.
?? JOIN ??? ??? ????? ??:
SELECT mt.ID, mt.ParentID, ot.MasterID FROM dbo.MainTable AS mt INNER JOIN dbo.OtherTable AS ot ON ot.ParentID = mt.ID OR ot.ID = mt.ParentID
? ?? LEFT JOIN? ???? ?????? ??? ?? ???????(? ??? ? 1??).
SELECT mt.ID, mt.ParentID,
CASE WHEN ot1.MasterID IS NOT NULL THEN ot1.MasterID ELSE ot2.MasterID END AS MasterID
FROM dbo.MainTable AS mt
LEFT JOIN dbo.OtherTable AS ot1 ON ot1.ParentID = mt.ID
LEFT JOIN dbo.OtherTable AS ot2 ON ot2.ID = mt.ParentID
WHERE ot1.MasterID IS NOT NULL OR ot2.MasterID IS NOT NULL
?? ??? ?????. OR ? ?? JOIN ??? ??? ???? ????? ???? ??? ??? ??? ??? ???? ?? ?????.
?? ??? ?????? ??? ????. JOIN ??? ?? OR? HASH JOIN ?? MERGE JOIN? ?? ???? ?? ??? ??? ? ????. ??? ??? ????? UNION:
SELECT * FROM maintable m JOIN othertable o ON o.parentId = m.id UNION SELECT * FROM maintable m JOIN othertable o ON o.id = m.parentId
??? SQL Server ??? ????? ??? ???? ???? ??? ?? ??? ??? ??? ?? ?? ??? ???? ??? ? ????. ????? LEFT JOIN ?? ??? ???? ?????? ?? ???? ??? ??? ? ????. ??? ?? ??? ?? ?? ???? OR? JOIN ??? ???? ???? ????? ??? ??? ?? ?????? ???.
? ??? ?? ??? ?? 'OR' ??? ???? SQL INNER JOIN ??? ??? ???? ? ?????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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?? ?? ???? MySQL ??????? ???? ??? ??????
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???? MySQL ?? ??? ????? ??? ??????
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MySQL Workbench? ?? ??? ??? ??????
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mysqlworkbench? ??? ?? ??? ?? ??? ?????. ?? ??? ?? ??? ?? ????. 1. Windows ???? %appdata %\ mysql \ workbench \ connections.xml? ????. 2. MacOS ???? ~/Library/ApplicationSupport/MySQL/Workbench/Connections.xml? ????. 3. ????? Linux ???? ~/.mysql/workbench/connections.xml ?? ~/.local/share/data/mysql/wor? ????.
