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sqlite3

    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