1 # 2009 December 9 2 # 3 # The author disclaims copyright to this source code. In place of 4 # a legal notice, here is a blessing: 5 # 6 # May you do good and not evil. 7 # May you find forgiveness for yourself and forgive others. 8 # May you share freely, never taking more than you give. 9 # 10 #*********************************************************************** 11 # This file implements regression tests for SQLite library. 12 # 13 # This file implements tests for N-way joins (N>2) which make 14 # use of USING or NATURAL JOIN. For such joins, the USING and 15 # NATURAL JOIN processing needs to search all tables to the left 16 # of the join looking for a match. See ticket [f74beaabde] 17 # for additional information. 18 # 19 20 set testdir [file dirname $argv0] 21 source $testdir/tester.tcl 22 23 24 # The problem as initially reported on the mailing list: 25 # 26 do_test join6-1.1 { 27 execsql { 28 CREATE TABLE t1(a); 29 CREATE TABLE t2(a); 30 CREATE TABLE t3(a,b); 31 INSERT INTO t1 VALUES(1); 32 INSERT INTO t3 VALUES(1,2); 33 34 SELECT * FROM t1 LEFT JOIN t2 USING(a) LEFT JOIN t3 USING(a); 35 } 36 } {1 2} 37 do_test join6-1.2 { 38 execsql { 39 SELECT t1.a, t3.b 40 FROM t1 LEFT JOIN t2 ON t1.a=t2.a LEFT JOIN t3 ON t2.a=t3.a; 41 } 42 } {1 {}} 43 do_test join6-1.3 { 44 execsql { 45 SELECT t1.a, t3.b 46 FROM t1 LEFT JOIN t2 ON t1.a=t2.a LEFT JOIN t3 ON t1.a=t3.a; 47 } 48 } {1 2} 49 50 51 do_test join6-2.1 { 52 execsql { 53 DROP TABLE t1; 54 DROP TABLE t2; 55 DROP TABLE t3; 56 57 CREATE TABLE t1(x,y); 58 CREATE TABLE t2(y,z); 59 CREATE TABLE t3(x,z); 60 61 INSERT INTO t1 VALUES(1,2); 62 INSERT INTO t1 VALUES(3,4); 63 64 INSERT INTO t2 VALUES(2,3); 65 INSERT INTO t2 VALUES(4,5); 66 67 INSERT INTO t3 VALUES(1,3); 68 INSERT INTO t3 VALUES(3,5); 69 70 SELECT * FROM t1 JOIN t2 USING (y) JOIN t3 USING(x); 71 } 72 } {1 2 3 3 3 4 5 5} 73 do_test join6-2.2 { 74 execsql { 75 SELECT * FROM t1 NATURAL JOIN t2 NATURAL JOIN t3; 76 } 77 } {1 2 3 3 4 5} 78 79 80 do_test join6-3.1 { 81 execsql { 82 DROP TABLE t1; 83 DROP TABLE t2; 84 DROP TABLE t3; 85 86 CREATE TABLE t1(a,x,y); 87 INSERT INTO t1 VALUES(1,91,92); 88 INSERT INTO t1 VALUES(2,93,94); 89 90 CREATE TABLE t2(b,y,z); 91 INSERT INTO t2 VALUES(3,92,93); 92 INSERT INTO t2 VALUES(4,94,95); 93 94 CREATE TABLE t3(c,x,z); 95 INSERT INTO t3 VALUES(5,91,93); 96 INSERT INTO t3 VALUES(6,99,95); 97 98 SELECT * FROM t1 NATURAL JOIN t2 NATURAL JOIN t3; 99 } 100 } {1 91 92 3 93 5} 101 do_test join6-3.2 { 102 execsql { 103 SELECT * FROM t1 JOIN t2 NATURAL JOIN t3; 104 } 105 } {1 91 92 3 92 93 5} 106 do_test join6-3.3 { 107 execsql { 108 SELECT * FROM t1 JOIN t2 USING(y) NATURAL JOIN t3; 109 } 110 } {1 91 92 3 93 5} 111 do_test join6-3.4 { 112 execsql { 113 SELECT * FROM t1 NATURAL JOIN t2 JOIN t3 USING(x,z); 114 } 115 } {1 91 92 3 93 5} 116 do_test join6-3.5 { 117 execsql { 118 SELECT * FROM t1 NATURAL JOIN t2 JOIN t3 USING(x); 119 } 120 } {1 91 92 3 93 5 93} 121 do_test join6-3.6 { 122 execsql { 123 SELECT * FROM t1 NATURAL JOIN t2 JOIN t3 USING(z); 124 } 125 } {1 91 92 3 93 5 91 2 93 94 4 95 6 99} 126 127 do_test join6-4.1 { 128 execsql { 129 SELECT * FROM 130 (SELECT 1 AS a, 91 AS x, 92 AS y UNION SELECT 2, 93, 94) 131 NATURAL JOIN t2 NATURAL JOIN t3 132 } 133 } {1 91 92 3 93 5} 134 do_test join6-4.2 { 135 execsql { 136 SELECT * FROM t1 NATURAL JOIN 137 (SELECT 3 AS b, 92 AS y, 93 AS z UNION SELECT 4, 94, 95) 138 NATURAL JOIN t3 139 } 140 } {1 91 92 3 93 5} 141 do_test join6-4.3 { 142 execsql { 143 SELECT * FROM t1 NATURAL JOIN t2 NATURAL JOIN 144 (SELECT 5 AS c, 91 AS x, 93 AS z UNION SELECT 6, 99, 95) 145 } 146 } {1 91 92 3 93 5} 147 148 149 150 151 152 153 154 155 156 157 158 finish_test 159
