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POOracle SQL outer join on multiple columns -miscoding
 

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  1. POOracle SQL outer join on multiple columns -miscoding
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    <p>According to <a href="http://www.orafaq.com/node/855" rel="nofollow">http://www.orafaq.com/node/855</a> The record in that table for "Incomplete Join Trail"</p> <p>Wrong way of coding is:</p> <pre><code>select * from T1, T2, T3, T4 where T1.C1 = T2.C1(+) and T2.C2 = T3.C2(+) and T3.C3 = T4.C3; </code></pre> <p>Right way of coding is:</p> <pre><code>select * from T1, T2, T3, T4 where T1.C1 = T2.C1(+) and T2.C2 = T3.C2(+) and T3.C3 = T4.C3(+); </code></pre> <p>This I couldn't understand. There is a possibility that I might want to do a equi-join T3 &amp; T4 and outer join between the other tables. Why is the author saying it is incorrect?</p> <p>According to <a href="http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:5229892958977" rel="nofollow">http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:5229892958977</a>,</p> <p>Tom is using the following example in his answer which seems similar to the "Incomplete Join Trail" example listed above,</p> <pre><code>select * from t1,t2,t3 where t1.x = t2.x and t2.y = t3.y(+); </code></pre> <p>Could anyone help me understand this?</p> <p>Edit:</p> <p>Please correct me if I am wrong. As per Allan's answer, the following code would be correct:</p> <pre><code>select * from T1, T2, T3, T4 where T3.C3 = T4.C3 and T1.C1 = T2.C1(+) and T2.C2 = T3.C2(+); </code></pre> <p>If the above is correct, will it be equivalent to the following quoted answer?.[ie., Can we do this in oracle's sql without the subquery in the quoted answer?]</p> <pre><code>SELECT * FROM t1, t2, (SELECT * FROM t3, t4 WHERE t3.c3 = t4.c3) t3_4 WHERE t1.c1 = t2.c1(+) AND t2.c2 = t3_4.c2(+); </code></pre>
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