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  • Committer: brian
  • Date: 2008-06-25 05:29:13 UTC
  • Revision ID: brian@localhost.localdomain-20080625052913-6upwo0jsrl4lnapl
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mysql-test/r/subselect2.result
 
1
drop table if exists t1, t2, t3, t4;
 
2
CREATE TABLE t1
 
3
(
 
4
DOCID VARCHAR(32)BINARY NOT NULL
 
5
, UUID VARCHAR(32)BINARY NOT NULL
 
6
, MIMETYPE VARCHAR(80)BINARY
 
7
, CONTENTDATA LONGBLOB
 
8
, CONTENTSIZE INTEGER
 
9
, VERSIONID INTEGER
 
10
, REPID VARCHAR(32)BINARY
 
11
, MODIFIED TIMESTAMP
 
12
, MODIFIER VARCHAR(255)BINARY
 
13
, ORIGINATOR INTEGER
 
14
, PRIMARY KEY ( DOCID )
 
15
) ENGINE=InnoDB
 
16
;
 
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INSERT INTO t1 (DOCID) VALUES ("1"), ("2");
 
18
Warnings:
 
19
Warning 1364    Field 'UUID' doesn't have a default value
 
20
CREATE TABLE t2
 
21
(
 
22
DOCID VARCHAR(32)BINARY NOT NULL
 
23
, DOCNAME VARCHAR(255)BINARY NOT NULL
 
24
, DOCTYPEID VARCHAR(32)BINARY NOT NULL
 
25
, FOLDERID VARCHAR(32)BINARY NOT NULL
 
26
, AUTHOR VARCHAR(255)BINARY
 
27
, CREATED TIMESTAMP NOT NULL
 
28
, TITLE VARCHAR(255)BINARY
 
29
, SUBTITLE VARCHAR(255)BINARY
 
30
, DOCABSTRACT LONGBLOB
 
31
, PUBLISHDATE TIMESTAMP
 
32
, EXPIRATIONDATE TIMESTAMP
 
33
, LOCKEDBY VARCHAR(80)BINARY
 
34
, STATUS VARCHAR(80)BINARY
 
35
, PARENTDOCID VARCHAR(32)BINARY
 
36
, REPID VARCHAR(32)BINARY
 
37
, MODIFIED TIMESTAMP NOT NULL
 
38
, MODIFIER VARCHAR(255)BINARY NOT NULL
 
39
, PUBLISHSTATUS INTEGER
 
40
, ORIGINATOR INTEGER
 
41
, PRIMARY KEY ( DOCID )
 
42
) ENGINE=InnoDB
 
43
;
 
44
CREATE INDEX DDOCTYPEID_IDX ON t2 (DOCTYPEID);
 
45
CREATE INDEX DFOLDERID_IDX ON t2 (FOLDERID);
 
46
CREATE TABLE t3
 
47
(
 
48
FOLDERID VARCHAR(32)BINARY NOT NULL
 
49
, FOLDERNAME VARCHAR(255)BINARY NOT NULL
 
50
, CREATOR VARCHAR(255)BINARY
 
51
, CREATED TIMESTAMP NOT NULL
 
52
, DESCRIPTION VARCHAR(255)BINARY
 
53
, FOLDERTYPE INTEGER NOT NULL
 
54
, MODIFIED TIMESTAMP
 
55
, MODIFIER VARCHAR(255)BINARY
 
56
, FOLDERSIZE INTEGER NOT NULL
 
57
, PARENTID VARCHAR(32)BINARY
 
58
, REPID VARCHAR(32)BINARY
 
59
, ORIGINATOR INTEGER
 
60
, PRIMARY KEY ( FOLDERID )
 
61
) ENGINE=InnoDB;
 
62
CREATE INDEX FFOLDERID_IDX ON t3 (FOLDERID);
 
63
CREATE INDEX CMFLDRPARNT_IDX ON t3 (PARENTID);
 
64
CREATE TABLE t4
 
65
(
 
66
DOCTYPEID VARCHAR(32)BINARY NOT NULL
 
67
, DOCTYPENAME VARCHAR(80)BINARY NOT NULL
 
68
, DESCRIPTION VARCHAR(255)BINARY
 
69
, EXTNDATA LONGBLOB
 
70
, MODIFIED TIMESTAMP
 
71
, MODIFIER VARCHAR(255)BINARY
 
72
, ORIGINATOR INTEGER
 
73
, PRIMARY KEY ( DOCTYPEID )
 
74
) ENGINE=InnoDB;
 
75
INSERT INTO t2 VALUES("c373e9f59cf15a6c3e57444553544200", "c373e9f59cf15a6c3e57444553544200", "340d243d45f111d497b00010a4ef934d", "2f6161e879db43c1a5b82c21ddc49089", NULL, "2003-06-06 07:48:42", NULL, NULL, NULL, "2003-06-06 07:48:42", "2003-06-06 07:48:42", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-06 07:48:42", "admin", "0", NULL);
 
76
INSERT INTO t2 VALUES("c373e9f5a472f43ba45e444553544200", "c373e9f5a472f43ba45e444553544200", "340d243d45f111d497b00010a4ef934d", "2f6161e879db43c1a5b82c21ddc49089", NULL, "2003-06-07 18:50:12", NULL, NULL, NULL, "2003-06-07 18:50:12", "2003-06-07 18:50:12", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-07 18:50:12", "admin", "0", NULL);
 
77
INSERT INTO t2 VALUES("c373e9f5a4a0f56014eb444553544200", "c373e9f5a4a0f56014eb444553544200", "340d243d45f111d497b00010a4ef934d", "2f6161e879db43c1a5b82c21ddc49089", NULL, "2003-06-07 19:39:26", NULL, NULL, NULL, "2003-06-07 19:39:26", "2003-06-07 19:39:26", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-07 19:39:26", "admin", "0", NULL);
 
78
INSERT INTO t2 VALUES("c373e9f5a4a0f8fa4a86444553544200", "c373e9f5a4a0f8fa4a86444553544200", "340d243d45f111d497b00010a4ef934d", "2f6161e879db43c1a5b82c21ddc49089", NULL, "2003-06-07 19:43:05", NULL, NULL, NULL, "2003-06-07 19:43:05", "2003-06-07 19:43:05", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-07 19:43:05", "admin", "0", NULL);
 
79
INSERT INTO t2 VALUES("c373e9f5ac7b537205ce444553544200", "c373e9f5ac7b537205ce444553544200", "340d243d45f111d497b00010a4ef934d", "2f6161e879db43c1a5b82c21ddc49089", NULL, "2003-06-09 08:15:24", NULL, NULL, NULL, "2003-06-09 08:15:24", "2003-06-09 08:15:24", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-09 08:15:24", "admin", "0", NULL);
 
80
INSERT INTO t2 VALUES("c373e9f5ad0792012454444553544200", "c373e9f5ad0792012454444553544200", "340d243d45f111d497b00010a4ef934d", "2f6161e879db43c1a5b82c21ddc49089", NULL, "2003-06-09 10:51:44", NULL, NULL, NULL, "2003-06-09 10:51:44", "2003-06-09 10:51:44", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-09 10:51:44", "admin", "0", NULL);
 
81
INSERT INTO t2 VALUES("c373e9f5ad079821ef34444553544200", "First Discussion", "c373e9f5ad079174ff17444553544200", "c373e9f5ad0796c0eca4444553544200", "Goldilocks", "2003-06-09 11:16:50", "Title: First Discussion", NULL, NULL, "2003-06-09 10:51:26", "2003-06-09 10:51:26", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-09 11:16:50", "admin", "0", NULL);
 
82
INSERT INTO t2 VALUES("c373e9f5ad07993f3859444553544200", "Last Discussion", "c373e9f5ad079174ff17444553544200", "c373e9f5ad0796c0eca4444553544200", "Goldilocks", "2003-06-09 11:21:06", "Title: Last Discussion", NULL, "Setting new abstract and keeping doc checked out", "2003-06-09 10:51:26", "2003-06-09 10:51:26", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-09 11:21:06", "admin", "0", NULL);
 
83
INSERT INTO t2 VALUES("c373e9f5ad079a3219c4444553544200", "testdoclayout", "340d243c45f111d497b00010a4ef934d", "c373e9f5ad0796c0eca4444553544200", "Goldilocks", "2003-06-09 11:25:31", "Title: Test doc layout", "Subtitle: test doc layout", NULL, "2003-06-09 10:51:27", "2003-06-09 10:51:27", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-09 11:25:31", "admin", "0", NULL);
 
84
INSERT INTO t3 VALUES("0c9aab05b15048c59bc35c8461507deb", "System", "System", "2003-06-05 16:30:00", "The system content repository folder.", "3", "2003-06-05 16:30:00", "System", "0", NULL, "9c9aab05b15048c59bc35c8461507deb", "1");
 
85
INSERT INTO t3 VALUES("2f6161e879db43c1a5b82c21ddc49089", "Default", "System", "2003-06-09 10:52:02", "The default content repository folder.", "3", "2003-06-05 16:30:00", "System", "0", NULL, "03eea05112b845949f3fd03278b5fe43", "1");
 
86
INSERT INTO t3 VALUES("c373e9f5ad0791724315444553544200", "AddDocumentTest", "admin", "2003-06-09 10:51:25", "Movie Reviews", "0", "2003-06-09 10:51:25", "admin", "0", "2f6161e879db43c1a5b82c21ddc49089", "03eea05112b845949f3fd03278b5fe43", NULL);
 
87
INSERT INTO t3 VALUES("c373e9f5ad07919e1963444553544200", "NewDestDirectory", "admin", "2003-06-09 10:51:28", "Adding new directory", "128", "2003-06-09 10:51:28", "admin", "0", "2f6161e879db43c1a5b82c21ddc49089", "03eea05112b845949f3fd03278b5fe43", NULL);
 
88
INSERT INTO t3 VALUES("c373e9f5ad07919fe525444553544200", "SubDestDirectory", "admin", "2003-06-09 10:51:28", "Adding new directory", "128", "2003-06-09 10:51:28", "admin", "0", "c373e9f5ad07919e1963444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
 
89
INSERT INTO t3 VALUES("c373e9f5ad0791a0dab5444553544200", "Level1", "admin", "2003-06-09 10:51:29", NULL, "0", "2003-06-09 10:51:29", "admin", "0", "2f6161e879db43c1a5b82c21ddc49089", "03eea05112b845949f3fd03278b5fe43", NULL);
 
90
INSERT INTO t3 VALUES("c373e9f5ad0791a14669444553544200", "Level2", "admin", "2003-06-09 10:51:29", NULL, "0", "2003-06-09 10:51:29", "admin", "0", "c373e9f5ad0791a0dab5444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
 
91
INSERT INTO t3 VALUES("c373e9f5ad0791a23c0e444553544200", "Level3", "admin", "2003-06-09 10:51:29", NULL, "0", "2003-06-09 10:51:29", "admin", "0", "c373e9f5ad0791a14669444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
 
92
INSERT INTO t3 VALUES("c373e9f5ad0791a6b11f444553544200", "Dir1", "admin", "2003-06-09 10:51:30", NULL, "0", "2003-06-09 10:51:30", "admin", "0", "2f6161e879db43c1a5b82c21ddc49089", "03eea05112b845949f3fd03278b5fe43", NULL);
 
93
INSERT INTO t3 VALUES("c373e9f5ad0791a897d6444553544200", "Dir2", "admin", "2003-06-09 10:51:30", NULL, "0", "2003-06-09 10:51:30", "admin", "0", "c373e9f5ad0791a6b11f444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
 
94
INSERT INTO t3 VALUES("c373e9f5ad0791a9a063444553544200", "NewDestDirectory", "admin", "2003-06-09 10:51:31", NULL, "0", "2003-06-09 10:51:31", "admin", "0", "c373e9f5ad0791a897d6444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
 
95
INSERT INTO t3 VALUES("c373e9f5ad0791aa73e3444553544200", "LevelA", "admin", "2003-06-09 10:51:31", NULL, "0", "2003-06-09 10:51:31", "admin", "0", "c373e9f5ad0791a0dab5444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
 
96
INSERT INTO t3 VALUES("c373e9f5ad0791ab034b444553544200", "LevelB", "admin", "2003-06-09 10:51:31", NULL, "0", "2003-06-09 10:51:31", "admin", "0", "c373e9f5ad0791aa73e3444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
 
97
INSERT INTO t3 VALUES("c373e9f5ad0791ac7311444553544200", "LevelC", "admin", "2003-06-09 10:51:32", NULL, "0", "2003-06-09 10:51:32", "admin", "0", "c373e9f5ad0791ab034b444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
 
98
INSERT INTO t3 VALUES("c373e9f5ad0791ad66cf444553544200", "test2", "admin", "2003-06-09 10:51:32", NULL, "0", "2003-06-09 10:51:32", "admin", "0", "c373e9f5ad0791724315444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
 
99
INSERT INTO t3 VALUES("c373e9f5ad0791aebd87444553544200", "test3", "admin", "2003-06-09 10:51:33", NULL, "0", "2003-06-09 10:51:33", "admin", "0", "c373e9f5ad0791ad66cf444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
 
100
INSERT INTO t3 VALUES("c373e9f5ad0791dbaac4444553544200", "Special Caf� Folder", "admin", "2003-06-09 10:51:43", "test folder names with special chars", "0", "2003-06-09 10:51:43", "admin", "0", "2f6161e879db43c1a5b82c21ddc49089", "03eea05112b845949f3fd03278b5fe43", NULL);
 
101
INSERT INTO t3 VALUES("c373e9f5ad0796bf913f444553544200", "CopiedFolder", "admin", "2003-06-09 11:09:05", "Movie Reviews", "0", "2003-06-09 11:09:05", "admin", "0", "c373e9f5ad0791a23c0e444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
 
102
INSERT INTO t3 VALUES("c373e9f5ad0796c0eca4444553544200", "Movie Reviews", "admin", "2003-06-09 11:09:13", "Movie Reviews", "0", "2003-06-09 11:09:13", "admin", "33", "c373e9f5ad0796bf913f444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
 
103
INSERT INTO t3 VALUES("c373e9f5ad0796d9b895444553544200", "NewBookFolder", "admin", "2003-06-09 11:12:41", "NewBooks - folder", "0", "2003-06-09 11:12:41", "admin", "0", "c373e9f5ad0796c0eca4444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
 
104
INSERT INTO t3 VALUES("c373e9f5ad079b4c9355444553544200", "CopiedFolder", "admin", "2003-06-09 11:26:34", "Movie Reviews", "0", "2003-06-09 11:26:34", "admin", "0", "2f6161e879db43c1a5b82c21ddc49089", "03eea05112b845949f3fd03278b5fe43", NULL);
 
105
INSERT INTO t4 VALUES("340d243c45f111d497b00010a4ef934d", "Document Layout", "The system Document Layouts Document Type", NULL, "2003-06-05 16:30:00", "System", "1");
 
106
INSERT INTO t4 VALUES("340d243d45f111d497b00010a4ef934d", "Default", "The default system Document Type", NULL, "2003-06-05 16:30:00", "System", "1");
 
107
INSERT INTO t4 VALUES("4d09dd60850711d4998a204c4f4f5020", "__SystemResourceType", "The type for all the uploaded resources", NULL, "2003-06-05 16:30:00", "System", "1");
 
108
INSERT INTO t4 VALUES("91d4d595478211d497b40010a4ef934d", "__PmcSystemDefaultType", "The type for all the default available fields", NULL, "2003-06-05 16:30:00", "System", "1");
 
109
INSERT INTO t4 VALUES("c373e9f59cf15a59b08a444553544200", "NoFieldDocType", "plain doc type", NULL, "2003-06-06 07:48:40", "admin", NULL);
 
110
INSERT INTO t4 VALUES("c373e9f59cf15a5c6a99444553544200", "Movie Review", "This doc type is for movie reviews", "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<props autocheckin=\"false\" autopublish=\"false\" binary=\"choice\" categories=\"none\" cleanup=\"false\" folder=\"none\"><![CDATA[Doc type for cm tests]]></props>\r\n", "2003-06-06 07:48:40", "admin", NULL);
 
111
INSERT INTO t4 VALUES("c373e9f59cf15a6116a5444553544200", "Special Doc�u20A4u20A4u0113����u016BType", "test special chars xxx� in doc type", NULL, "2003-06-06 07:48:41", "admin", NULL);
 
112
INSERT INTO t4 VALUES("c373e9f59cf15a695d47444553544200", "Movie", NULL, NULL, "2003-06-06 07:48:41", "admin", NULL);
 
113
INSERT INTO t4 VALUES("c373e9f5ad079174ff17444553544200", "Discussion", NULL, NULL, "2003-06-09 10:51:25", "admin", NULL);
 
114
INSERT INTO t4 VALUES("c373e9f5ad0791da7e2b444553544200", "Books", "list of recommended books", "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<props autocheckin=\"false\" autopublish=\"false\" binary=\"choice\" categories=\"none\" cleanup=\"false\" folder=\"none\"><![CDATA[Doc type for cm tests]]><![CDATA[Doc type for book tests]]></props>\r\n", "2003-06-09 10:51:40", "admin", NULL);
 
115
ALTER TABLE t2 ADD  FOREIGN KEY FK_DCMNTS_DCTYPES ( DOCTYPEID)
 
116
REFERENCES t4 (DOCTYPEID );
 
117
ALTER TABLE t2 ADD  FOREIGN KEY FK_DCMNTS_FLDRS ( FOLDERID)
 
118
REFERENCES t3 (FOLDERID );
 
119
ALTER TABLE t3 ADD  FOREIGN KEY FK_FLDRS_PRNTID ( PARENTID)
 
120
REFERENCES t3 (FOLDERID );
 
121
SELECT t2.*, t4.DOCTYPENAME, t1.CONTENTSIZE,t1.MIMETYPE FROM t2 INNER JOIN t4 ON t2.DOCTYPEID = t4.DOCTYPEID LEFT OUTER JOIN t1 ON t2.DOCID = t1.DOCID WHERE t2.FOLDERID IN(SELECT t3.FOLDERID FROM t3 WHERE t3.PARENTID IN(SELECT t3.FOLDERID FROM t3 WHERE t3.PARENTID IN(SELECT t3.FOLDERID FROM t3 WHERE t3.PARENTID IN(SELECT t3.FOLDERID FROM t3 WHERE t3.PARENTID IN(SELECT t3.FOLDERID FROM t3 WHERE t3.PARENTID='2f6161e879db43c1a5b82c21ddc49089' AND t3.FOLDERNAME = 'Level1') AND t3.FOLDERNAME = 'Level2') AND t3.FOLDERNAME = 'Level3') AND t3.FOLDERNAME = 'CopiedFolder') AND t3.FOLDERNAME = 'Movie Reviews') AND t2.DOCNAME = 'Last Discussion';
 
122
DOCID   DOCNAME DOCTYPEID       FOLDERID        AUTHOR  CREATED TITLE   SUBTITLE        DOCABSTRACT     PUBLISHDATE     EXPIRATIONDATE  LOCKEDBY        STATUS  PARENTDOCID     REPID   MODIFIED        MODIFIER        PUBLISHSTATUS   ORIGINATOR      DOCTYPENAME     CONTENTSIZE     MIMETYPE
 
123
c373e9f5ad07993f3859444553544200        Last Discussion c373e9f5ad079174ff17444553544200        c373e9f5ad0796c0eca4444553544200        Goldilocks      2003-06-09 11:21:06     Title: Last Discussion  NULL    Setting new abstract and keeping doc checked out        2003-06-09 10:51:26     2003-06-09 10:51:26     NULL    NULL    NULL    03eea05112b845949f3fd03278b5fe43        2003-06-09 11:21:06     admin   0       NULL    Discussion      NULL    NULL
 
124
EXPLAIN SELECT t2.*, t4.DOCTYPENAME, t1.CONTENTSIZE,t1.MIMETYPE FROM t2 INNER JOIN t4 ON t2.DOCTYPEID = t4.DOCTYPEID LEFT OUTER JOIN t1 ON t2.DOCID = t1.DOCID WHERE t2.FOLDERID IN(SELECT t3.FOLDERID FROM t3 WHERE t3.PARENTID IN(SELECT t3.FOLDERID FROM t3 WHERE t3.PARENTID IN(SELECT t3.FOLDERID FROM t3 WHERE t3.PARENTID IN(SELECT t3.FOLDERID FROM t3 WHERE t3.PARENTID IN(SELECT t3.FOLDERID FROM t3 WHERE t3.PARENTID='2f6161e879db43c1a5b82c21ddc49089' AND t3.FOLDERNAME = 'Level1') AND t3.FOLDERNAME = 'Level2') AND t3.FOLDERNAME = 'Level3') AND t3.FOLDERNAME = 'CopiedFolder') AND t3.FOLDERNAME = 'Movie Reviews') AND t2.DOCNAME = 'Last Discussion';
 
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id      select_type     table   type    possible_keys   key     key_len ref     rows    Extra
 
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1       PRIMARY t4      ALL     PRIMARY NULL    NULL    NULL    10      
 
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1       PRIMARY t2      ALL     DDOCTYPEID_IDX,DFOLDERID_IDX    NULL    NULL    NULL    9       Using where; Using join buffer
 
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1       PRIMARY t1      eq_ref  PRIMARY PRIMARY 34      test.t2.DOCID   1       
 
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1       PRIMARY t3      eq_ref  PRIMARY,FFOLDERID_IDX,CMFLDRPARNT_IDX   PRIMARY 34      test.t2.FOLDERID        1       Using where
 
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1       PRIMARY t3      eq_ref  PRIMARY,FFOLDERID_IDX,CMFLDRPARNT_IDX   PRIMARY 34      test.t3.PARENTID        1       Using where; FirstMatch(t3)
 
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1       PRIMARY t3      eq_ref  PRIMARY,FFOLDERID_IDX,CMFLDRPARNT_IDX   PRIMARY 34      test.t3.PARENTID        1       Using where; FirstMatch(t3)
 
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1       PRIMARY t3      eq_ref  PRIMARY,FFOLDERID_IDX,CMFLDRPARNT_IDX   PRIMARY 34      test.t3.PARENTID        1       Using where; FirstMatch(t3)
 
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1       PRIMARY t3      eq_ref  PRIMARY,FFOLDERID_IDX,CMFLDRPARNT_IDX   PRIMARY 34      test.t3.PARENTID        1       Using where; FirstMatch(t3)
 
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drop table t1, t2, t3, t4;
 
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CREATE TABLE t1 (a int(10) , PRIMARY KEY (a)) Engine=InnoDB;
 
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INSERT INTO t1 VALUES (1),(2);
 
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CREATE TABLE t2 (a int(10), PRIMARY KEY (a)) Engine=InnoDB;
 
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INSERT INTO t2 VALUES (1);
 
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CREATE TABLE t3 (a int(10), b int(10), c int(10),
 
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PRIMARY KEY (a)) Engine=InnoDB;
 
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INSERT INTO t3 VALUES (1,2,1);
 
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SELECT t1.* FROM t1 WHERE (SELECT COUNT(*) FROM t3,t2 WHERE t3.c=t2.a 
 
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and t2.a='1' AND t1.a=t3.b) > 0;
 
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a
 
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2
 
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DROP TABLE t1,t2,t3;