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Remove cross joins and add IN+subquery joins

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mariadb-BharathBokka
2021-02-08 12:20:33 +00:00
parent 98949580ef
commit d5f4a19cff
2 changed files with 11 additions and 11 deletions
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18
mtr/future/mcol641-joins.result
View File

@@ -44,15 +44,15 @@ de1 de2 d1 d2
0.12345678901234567890123456789000000000 1.1234567891 NULL NULL
0.12345678901234567890123456789012345678 1234567890123456789012345678.0123456789 12345678901234567890123456789012345678 1234567890123456789012345678.1234567890
0.99999999999999999999999999999999999998 9999999999999999999999999999.9999999998 99999999999999999999999999999999999998 9999999999999999999999999999.9999999998
SELECT cs1.d1, cs1.d3, cs2.de1, cs2.de2 FROM cs1 CROSS JOIN cs2 ON cs1.d2 = cs2.de2 ORDER BY 1;
d1 d3 de1 de2
0 0.12345678901234567890123456789123450000 0.12345678901234567890123456789000000000 1.1234567891
99999999999999999999999999999999999998 0.99999999999999999999999999999999999998 0.99999999999999999999999999999999999998 9999999999999999999999999999.9999999998
SELECT cs2.de1, cs2.de2, cs1.d1, cs1.d2 FROM cs1 CROSS JOIN cs2 ON cs1.d3 = cs2.de1 ORDER BY 1;
de1 de2 d1 d2
-0.12345678901234567890123456789012345678 -1234567890123456789012345678.0123456789 -12345678901234567890123456789012345678 -1234567890123456789012345678.1234567890
0.12345678901234567890123456789012345678 1234567890123456789012345678.0123456789 12345678901234567890123456789012345678 1234567890123456789012345678.1234567890
0.99999999999999999999999999999999999998 9999999999999999999999999999.9999999998 99999999999999999999999999999999999998 9999999999999999999999999999.9999999998
SELECT * FROM cs1 WHERE cs1.d2 IN (SELECT cs2.de2 FROM cs2) ORDER BY 1;
d1 d2 d3
0 1.1234567891 0.12345678901234567890123456789123450000
99999999999999999999999999999999999998 9999999999999999999999999999.9999999998 0.99999999999999999999999999999999999998
SELECT * FROM cs2 WHERE cs2.de1 IN (SELECT cs1.d3 FROM cs1) ORDER BY 1;
de1 de2
-0.12345678901234567890123456789012345678 -1234567890123456789012345678.0123456789
0.12345678901234567890123456789012345678 1234567890123456789012345678.0123456789
0.99999999999999999999999999999999999998 9999999999999999999999999999.9999999998
SELECT count(*) FROM cs1 where exists (SELECT cs2.de2 FROM cs2 WHERE cs1.d2=cs2.de2);
count(*)
2

4
mtr/future/mcol641-joins.test
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@@ -29,8 +29,8 @@ SELECT cs1.d3, cs1.d1, cs1.d2, cs2.de2 FROM cs1 LEFT JOIN cs2 ON cs1.d3 = cs2.de
SELECT cs1.d1, cs1.d3, cs2.de1, cs2.de2 FROM cs1 RIGHT JOIN cs2 ON cs1.d2 = cs2.de2 ORDER BY 1;
SELECT cs2.de1, cs2.de2, cs1.d1, cs1.d2 FROM cs1 RIGHT JOIN cs2 ON cs1.d3 = cs2.de1 ORDER BY 1;
SELECT cs1.d1, cs1.d3, cs2.de1, cs2.de2 FROM cs1 CROSS JOIN cs2 ON cs1.d2 = cs2.de2 ORDER BY 1;
SELECT cs2.de1, cs2.de2, cs1.d1, cs1.d2 FROM cs1 CROSS JOIN cs2 ON cs1.d3 = cs2.de1 ORDER BY 1;
SELECT * FROM cs1 WHERE cs1.d2 IN (SELECT cs2.de2 FROM cs2) ORDER BY 1;
SELECT * FROM cs2 WHERE cs2.de1 IN (SELECT cs1.d3 FROM cs1) ORDER BY 1;
SELECT count(*) FROM cs1 where exists (SELECT cs2.de2 FROM cs2 WHERE cs1.d2=cs2.de2);
SELECT count(*) FROM cs2 where not exists (SELECT cs1.d2 FROM cs1 WHERE cs1.d2=cs2.de2);