Annotation of embedaddon/sqlite3/test/null.test, revision 1.1
1.1 ! misho 1: # 2001 September 15
! 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 proper treatment of the special
! 14: # value NULL.
! 15: #
! 16:
! 17: set testdir [file dirname $argv0]
! 18: source $testdir/tester.tcl
! 19:
! 20: # Create a table and some data to work with.
! 21: #
! 22: do_test null-1.0 {
! 23: execsql {
! 24: begin;
! 25: create table t1(a,b,c);
! 26: insert into t1 values(1,0,0);
! 27: insert into t1 values(2,0,1);
! 28: insert into t1 values(3,1,0);
! 29: insert into t1 values(4,1,1);
! 30: insert into t1 values(5,null,0);
! 31: insert into t1 values(6,null,1);
! 32: insert into t1 values(7,null,null);
! 33: commit;
! 34: select * from t1;
! 35: }
! 36: } {1 0 0 2 0 1 3 1 0 4 1 1 5 {} 0 6 {} 1 7 {} {}}
! 37:
! 38: # Check for how arithmetic expressions handle NULL
! 39: #
! 40: do_test null-1.1 {
! 41: execsql {
! 42: select ifnull(a+b,99) from t1;
! 43: }
! 44: } {1 2 4 5 99 99 99}
! 45: do_test null-1.2 {
! 46: execsql {
! 47: select ifnull(b*c,99) from t1;
! 48: }
! 49: } {0 0 0 1 99 99 99}
! 50:
! 51: # Check to see how the CASE expression handles NULL values. The
! 52: # first WHEN for which the test expression is TRUE is selected.
! 53: # FALSE and UNKNOWN test expressions are skipped.
! 54: #
! 55: do_test null-2.1 {
! 56: execsql {
! 57: select ifnull(case when b<>0 then 1 else 0 end, 99) from t1;
! 58: }
! 59: } {0 0 1 1 0 0 0}
! 60: do_test null-2.2 {
! 61: execsql {
! 62: select ifnull(case when not b<>0 then 1 else 0 end, 99) from t1;
! 63: }
! 64: } {1 1 0 0 0 0 0}
! 65: do_test null-2.3 {
! 66: execsql {
! 67: select ifnull(case when b<>0 and c<>0 then 1 else 0 end, 99) from t1;
! 68: }
! 69: } {0 0 0 1 0 0 0}
! 70: do_test null-2.4 {
! 71: execsql {
! 72: select ifnull(case when not (b<>0 and c<>0) then 1 else 0 end, 99) from t1;
! 73: }
! 74: } {1 1 1 0 1 0 0}
! 75: do_test null-2.5 {
! 76: execsql {
! 77: select ifnull(case when b<>0 or c<>0 then 1 else 0 end, 99) from t1;
! 78: }
! 79: } {0 1 1 1 0 1 0}
! 80: do_test null-2.6 {
! 81: execsql {
! 82: select ifnull(case when not (b<>0 or c<>0) then 1 else 0 end, 99) from t1;
! 83: }
! 84: } {1 0 0 0 0 0 0}
! 85: do_test null-2.7 {
! 86: execsql {
! 87: select ifnull(case b when c then 1 else 0 end, 99) from t1;
! 88: }
! 89: } {1 0 0 1 0 0 0}
! 90: do_test null-2.8 {
! 91: execsql {
! 92: select ifnull(case c when b then 1 else 0 end, 99) from t1;
! 93: }
! 94: } {1 0 0 1 0 0 0}
! 95:
! 96: # Check to see that NULL values are ignored in aggregate functions.
! 97: #
! 98: do_test null-3.1 {
! 99: execsql {
! 100: select count(*), count(b), count(c), sum(b), sum(c),
! 101: avg(b), avg(c), min(b), max(b) from t1;
! 102: }
! 103: } {7 4 6 2 3 0.5 0.5 0 1}
! 104:
! 105: # The sum of zero entries is a NULL, but the total of zero entries is 0.
! 106: #
! 107: do_test null-3.2 {
! 108: execsql {
! 109: SELECT sum(b), total(b) FROM t1 WHERE b<0
! 110: }
! 111: } {{} 0.0}
! 112:
! 113: # Check to see how WHERE clauses handle NULL values. A NULL value
! 114: # is the same as UNKNOWN. The WHERE clause should only select those
! 115: # rows that are TRUE. FALSE and UNKNOWN rows are rejected.
! 116: #
! 117: do_test null-4.1 {
! 118: execsql {
! 119: select a from t1 where b<10
! 120: }
! 121: } {1 2 3 4}
! 122: do_test null-4.2 {
! 123: execsql {
! 124: select a from t1 where not b>10
! 125: }
! 126: } {1 2 3 4}
! 127: do_test null-4.3 {
! 128: execsql {
! 129: select a from t1 where b<10 or c=1;
! 130: }
! 131: } {1 2 3 4 6}
! 132: do_test null-4.4 {
! 133: execsql {
! 134: select a from t1 where b<10 and c=1;
! 135: }
! 136: } {2 4}
! 137: do_test null-4.5 {
! 138: execsql {
! 139: select a from t1 where not (b<10 and c=1);
! 140: }
! 141: } {1 3 5}
! 142:
! 143: # The DISTINCT keyword on a SELECT statement should treat NULL values
! 144: # as distinct
! 145: #
! 146: do_test null-5.1 {
! 147: execsql {
! 148: select distinct b from t1 order by b;
! 149: }
! 150: } {{} 0 1}
! 151:
! 152: # A UNION to two queries should treat NULL values
! 153: # as distinct.
! 154: #
! 155: # (Later:) We also take this opportunity to test the ability
! 156: # of an ORDER BY clause to bind to either SELECT of a UNION.
! 157: # The left-most SELECT is preferred. In standard SQL, only
! 158: # the left SELECT can be used. The ability to match an ORDER
! 159: # BY term to the right SELECT is an SQLite extension.
! 160: #
! 161: ifcapable compound {
! 162: do_test null-6.1 {
! 163: execsql {
! 164: select b from t1 union select c from t1 order by b;
! 165: }
! 166: } {{} 0 1}
! 167: do_test null-6.2 {
! 168: execsql {
! 169: select b from t1 union select c from t1 order by 1;
! 170: }
! 171: } {{} 0 1}
! 172: do_test null-6.3 {
! 173: execsql {
! 174: select b from t1 union select c from t1 order by t1.b;
! 175: }
! 176: } {{} 0 1}
! 177: do_test null-6.4 {
! 178: execsql {
! 179: select b from t1 union select c from t1 order by main.t1.b;
! 180: }
! 181: } {{} 0 1}
! 182: do_test null-6.5 {
! 183: catchsql {
! 184: select b from t1 union select c from t1 order by t1.a;
! 185: }
! 186: } {1 {1st ORDER BY term does not match any column in the result set}}
! 187: do_test null-6.6 {
! 188: catchsql {
! 189: select b from t1 union select c from t1 order by main.t1.a;
! 190: }
! 191: } {1 {1st ORDER BY term does not match any column in the result set}}
! 192: } ;# ifcapable compound
! 193:
! 194: # The UNIQUE constraint only applies to non-null values
! 195: #
! 196: ifcapable conflict {
! 197: do_test null-7.1 {
! 198: execsql {
! 199: create table t2(a, b unique on conflict ignore);
! 200: insert into t2 values(1,1);
! 201: insert into t2 values(2,null);
! 202: insert into t2 values(3,null);
! 203: insert into t2 values(4,1);
! 204: select a from t2;
! 205: }
! 206: } {1 2 3}
! 207: do_test null-7.2 {
! 208: execsql {
! 209: create table t3(a, b, c, unique(b,c) on conflict ignore);
! 210: insert into t3 values(1,1,1);
! 211: insert into t3 values(2,null,1);
! 212: insert into t3 values(3,null,1);
! 213: insert into t3 values(4,1,1);
! 214: select a from t3;
! 215: }
! 216: } {1 2 3}
! 217: }
! 218:
! 219: # Ticket #461 - Make sure nulls are handled correctly when doing a
! 220: # lookup using an index.
! 221: #
! 222: do_test null-8.1 {
! 223: execsql {
! 224: CREATE TABLE t4(x,y);
! 225: INSERT INTO t4 VALUES(1,11);
! 226: INSERT INTO t4 VALUES(2,NULL);
! 227: SELECT x FROM t4 WHERE y=NULL;
! 228: }
! 229: } {}
! 230: ifcapable subquery {
! 231: do_test null-8.2 {
! 232: execsql {
! 233: SELECT x FROM t4 WHERE y IN (33,NULL);
! 234: }
! 235: } {}
! 236: }
! 237: do_test null-8.3 {
! 238: execsql {
! 239: SELECT x FROM t4 WHERE y<33 ORDER BY x;
! 240: }
! 241: } {1}
! 242: do_test null-8.4 {
! 243: execsql {
! 244: SELECT x FROM t4 WHERE y>6 ORDER BY x;
! 245: }
! 246: } {1}
! 247: do_test null-8.5 {
! 248: execsql {
! 249: SELECT x FROM t4 WHERE y!=33 ORDER BY x;
! 250: }
! 251: } {1}
! 252: do_test null-8.11 {
! 253: execsql {
! 254: CREATE INDEX t4i1 ON t4(y);
! 255: SELECT x FROM t4 WHERE y=NULL;
! 256: }
! 257: } {}
! 258: ifcapable subquery {
! 259: do_test null-8.12 {
! 260: execsql {
! 261: SELECT x FROM t4 WHERE y IN (33,NULL);
! 262: }
! 263: } {}
! 264: }
! 265: do_test null-8.13 {
! 266: execsql {
! 267: SELECT x FROM t4 WHERE y<33 ORDER BY x;
! 268: }
! 269: } {1}
! 270: do_test null-8.14 {
! 271: execsql {
! 272: SELECT x FROM t4 WHERE y>6 ORDER BY x;
! 273: }
! 274: } {1}
! 275: do_test null-8.15 {
! 276: execsql {
! 277: SELECT x FROM t4 WHERE y!=33 ORDER BY x;
! 278: }
! 279: } {1}
! 280:
! 281:
! 282:
! 283: finish_test
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