github.com/jdgcs/sqlite3@v1.12.1-0.20210908114423-bc5f96e4dd51/testdata/tcl/selectE.test (about)

     1  # 2013-05-07
     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 compound SELECT statements
    12  # that have ORDER BY clauses with collating sequences that differ
    13  # from the collating sequence used for comparison in the compound.
    14  # 
    15  # Ticket 6709574d2a8d8b9be3a9cb1afbf4ff2de48ea4e7:
    16  # drh added on 2013-05-06 15:21:16:
    17  #
    18  # In the code shown below (which is intended to be run from the
    19  # sqlite3.exe command-line tool) the three SELECT statements should all
    20  # generate the same answer. But the third one does not. It is as if the
    21  # COLLATE clause on the ORDER BY somehow got pulled into the EXCEPT
    22  # operator. Note that the ".print" commands are instructions to the
    23  # sqlite3.exe shell program to output delimiter lines so that you can more
    24  # easily tell where the output of one query ends and the next query
    25  # begins. 
    26  # 
    27  #     CREATE TABLE t1(a);
    28  #     INSERT INTO t1 VALUES('abc'),('def');
    29  #     CREATE TABLE t2(a);
    30  #     INSERT INTO t2 VALUES('DEF');
    31  # 
    32  #     SELECT a FROM t1 EXCEPT SELECT a FROM t2 ORDER BY a;
    33  #     .print -----
    34  #     SELECT a FROM (SELECT a FROM t1 EXCEPT SELECT a FROM t2)
    35  #      ORDER BY a COLLATE nocase;
    36  #     .print -----
    37  #     SELECT a FROM t1 EXCEPT SELECT a FROM t2 ORDER BY a COLLATE nocase;
    38  # 
    39  # Bisecting shows that this problem was introduced in SQLite version 3.6.0
    40  # by check-in [8bbfa97837a74ef] on 2008-06-15. 
    41  #
    42  
    43  set testdir [file dirname $argv0]
    44  source $testdir/tester.tcl
    45  
    46  do_test selectE-1.0 {
    47    db eval {
    48      CREATE TABLE t1(a);
    49      INSERT INTO t1 VALUES('abc'),('def'),('ghi');
    50      CREATE TABLE t2(a);
    51      INSERT INTO t2 VALUES('DEF'),('abc');
    52      CREATE TABLE t3(a);
    53      INSERT INTO t3 VALUES('def'),('jkl');
    54  
    55      SELECT a FROM t1 EXCEPT SELECT a FROM t2
    56       ORDER BY a COLLATE nocase;
    57    }
    58  } {def ghi}
    59  do_test selectE-1.1 {
    60    db eval {
    61      SELECT a FROM t2 EXCEPT SELECT a FROM t3
    62       ORDER BY a COLLATE nocase;
    63    }
    64  } {abc DEF}
    65  do_test selectE-1.2 {
    66    db eval {
    67      SELECT a FROM t2 EXCEPT SELECT a FROM t3
    68       ORDER BY a COLLATE binary;
    69    }
    70  } {DEF abc}
    71  do_test selectE-1.3 {
    72    db eval {
    73      SELECT a FROM t2 EXCEPT SELECT a FROM t3
    74       ORDER BY a;
    75    }
    76  } {DEF abc}
    77  
    78  do_test selectE-2.1 {
    79    db eval {
    80      DELETE FROM t2;
    81      DELETE FROM t3;
    82      INSERT INTO t2 VALUES('ABC'),('def'),('GHI'),('jkl');
    83      INSERT INTO t3 SELECT lower(a) FROM t2;
    84      SELECT a COLLATE nocase FROM t2 EXCEPT SELECT a FROM t3
    85       ORDER BY 1
    86    }
    87  } {}
    88  do_test selectE-2.2 {
    89    db eval {
    90      SELECT a COLLATE nocase FROM t2 EXCEPT SELECT a FROM t3
    91       ORDER BY 1 COLLATE binary
    92    }
    93  } {}
    94  
    95  do_catchsql_test selectE-3.1 {
    96    SELECT 1 EXCEPT SELECT 2 ORDER BY 1 COLLATE nocase EXCEPT SELECT 3;
    97  } {1 {ORDER BY clause should come after EXCEPT not before}}
    98  
    99  
   100  finish_test