40 lines
874 B
MySQL
40 lines
874 B
MySQL
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-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
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-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
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-- DROP TABLE test_users;
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-- DROP TABLE test_objects;
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CREATE TABLE test_users AS SELECT * FROM all_users;
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CREATE TABLE test_objects AS SELECT * FROM all_objects;
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@gts test_users
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@gts test_objects
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@53on
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SELECT /*+ GATHER_PLAN_STATISTICS */
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u.username
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, (SELECT MAX(created) FROM test_objects o WHERE o.owner = u.username)
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FROM
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test_users u
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WHERE
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username LIKE 'S%'
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/
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@53off
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@xall
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@53on
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-- ALTER SESSION SET "_optimizer_unnest_scalar_sq" = FALSE;
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SELECT /*+ GATHER_PLAN_STATISTICS NO_UNNEST(@ssq) */
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u.username
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, (SELECT /*+ QB_NAME(ssq) */ MAX(created) FROM test_objects o WHERE o.owner = u.username)
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FROM
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test_users u
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WHERE
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username LIKE 'S%'
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/
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@53off
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@xall
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