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CREATE TABLE T1(
 C1 int,
 C2 int
)
GO
CREATE INDEX IND_T1 ON T1 (C1, C2)
GO
CREATE TABLE T2(
 C1 int,
 C2 int
)
GO
CREATE INDEX IND_T2 ON T2 (C1, C2)
GO
INSERT INTO T1 VALUES (1, 0)
GO
INSERT INTO T1 VALUES (2, 0)
GO
INSERT INTO T2 VALUES (1, -1)
GO
INSERT INTO T2 VALUES (2, 0)
GO
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SELECT T1.C1 [T1.C1], T1.C2 [T1.C2], T2.C1 [T2.C1], T2.C2 [T2.C2]
FROM T1 INNER JOIN T2 ON
T1.C1 = T2.C1
AND (T1.C2 = T2.C2 OR T2.C2 = -1)
GO
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SELECT T1.C1 [T1.C1], T1.C2 [T1.C2], T2.C1 [T2.C1], T2.C2 [T2.C2]
FROM T1 INNER JOIN T2 ON
T1.C1 = T2.C1
WHERE T1.C2 = T2.C2 OR T2.C2 = -1
GO

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SELECT T1.C1 [T1.C1], T1.C2 [T1.C2], T2.C1 [T2.C1], T2.C2 [T2.C2]
FROM T1 INNER JOIN T2 WITH (INDEX(0)) ON
T1.C1 = T2.C1
AND (T1.C2 = T2.C2 OR T2.C2 = -1)
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FROM T1 INNER JOIN T2 ON
(T1.C1 = T2.C1 AND T2.C2 = -1) OR (T1.C1 = T2.C1 AND T1.C2 = T2.C2)

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