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sqlite3

    1: # 2009 November 10
    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: # Additional test cases for the COALESCE() and IFNULL() functions.
   12: #
   13: 
   14: set testdir [file dirname $argv0]
   15: source $testdir/tester.tcl
   16: 
   17: 
   18: do_test coalesce-1.0 {
   19:   db eval {
   20:     CREATE TABLE t1(a INTEGER PRIMARY KEY, b, c, d);
   21:     INSERT INTO t1 VALUES(1, null, null, null);
   22:     INSERT INTO t1 VALUES(2, 2, 99, 99);
   23:     INSERT INTO t1 VALUES(3, null, 3, 99);
   24:     INSERT INTO t1 VALUES(4, null, null, 4);
   25:     INSERT INTO t1 VALUES(5, null, null, null);
   26:     INSERT INTO t1 VALUES(6, 22, 99, 99);
   27:     INSERT INTO t1 VALUES(7, null, 33, 99);
   28:     INSERT INTO t1 VALUES(8, null, null, 44);
   29: 
   30:     SELECT coalesce(b,c,d) FROM t1 ORDER BY a;
   31:   }
   32: } {{} 2 3 4 {} 22 33 44}
   33: do_test coalesce-1.1 {
   34:   db eval {
   35:     SELECT coalesce(d+c+b,d+c,d) FROM t1 ORDER BY a;
   36:   }
   37: } {{} 200 102 4 {} 220 132 44}
   38: do_test coalesce-1.2 {
   39:   db eval {
   40:     SELECT ifnull(d+c+b,ifnull(d+c,d)) FROM t1 ORDER BY a;
   41:   }
   42: } {{} 200 102 4 {} 220 132 44}
   43: do_test coalesce-1.3 {
   44:   db eval {
   45:     SELECT ifnull(ifnull(d+c+b,d+c),d) FROM t1 ORDER BY a;
   46:   }
   47: } {{} 200 102 4 {} 220 132 44}
   48: do_test coalesce-1.4 {
   49:   db eval {
   50:     SELECT ifnull(ifnull(b,c),d) FROM t1 ORDER BY a;
   51:   }
   52: } {{} 2 3 4 {} 22 33 44}
   53: do_test coalesce-1.5 {
   54:   db eval {
   55:     SELECT ifnull(b,ifnull(c,d)) FROM t1 ORDER BY a;
   56:   }
   57: } {{} 2 3 4 {} 22 33 44}
   58: do_test coalesce-1.6 {
   59:   db eval {
   60:     SELECT coalesce(b,NOT b,-b,abs(b),lower(b),length(b),min(b,5),b*123,c)
   61:       FROM t1 ORDER BY a;
   62:   }
   63: } {{} 2 3 {} {} 22 33 {}}
   64: do_test coalesce-1.7 {
   65:   db eval {
   66:     SELECT ifnull(nullif(a,4),99)
   67:       FROM t1 ORDER BY a;
   68:   }
   69: } {1 2 3 99 5 6 7 8}
   70: do_test coalesce-1.8 {
   71:   db eval {
   72: pragma vdbe_listing=on;
   73:     SELECT coalesce(
   74:       CASE WHEN b=2 THEN 123 END,
   75:       CASE WHEN b=3 THEN 234 END,
   76:       CASE WHEN c=3 THEN 345 WHEN c=33 THEN 456 END,
   77:       d
   78:     )
   79:     FROM t1 ORDER BY a;
   80:   }
   81: } {{} 123 345 4 {} 99 456 44}
   82: 
   83: 
   84: finish_test