# 2001 September 27

 #

 # The author disclaims copyright to this source code.  In place of

 # a legal notice, here is a blessing:

 #

 #    May you do good and not evil.

 #    May you find forgiveness for yourself and forgive others.

 #    May you share freely, never taking more than you give.

 #

 #***********************************************************************

 # This file implements regression tests for SQLite library.  The

 # focus of this file is testing the CREATE UNIQUE INDEX statement,

 # and primary keys, and the UNIQUE constraint on table columns

 #

 # $Id: unique.test,v 1.8 2005/06/24 03:53:06 drh Exp $

 set testdir [file dirname $argv0]

 source $testdir/tester.tcl

 # Try to create a table with two primary keys.

 # (This is allowed in SQLite even that it is not valid SQL)

 #

 do_test unique-1.1 {

   catchsql {

     CREATE TABLE t1(

        a int PRIMARY KEY,

        b int PRIMARY KEY,

        c text

     );

   }

 } {1 {table "t1" has more than one primary key}}

 do_test unique-1.1b {

   catchsql {

     CREATE TABLE t1(

        a int PRIMARY KEY,

        b int UNIQUE,

        c text

     );

   }

 } {0 {}}

 do_test unique-1.2 {

   catchsql {

     INSERT INTO t1(a,b,c) VALUES(1,2,3)

   }

 } {0 {}}

 do_test unique-1.3 {

   catchsql {

     INSERT INTO t1(a,b,c) VALUES(1,3,4)

   }

 } {1 {column a is not unique}}

 do_test unique-1.4 {

   execsql {

     SELECT * FROM t1 ORDER BY a;

   }

 } {1 2 3}

 do_test unique-1.5 {

   catchsql {

     INSERT INTO t1(a,b,c) VALUES(3,2,4)

   }

 } {1 {column b is not unique}}

 do_test unique-1.6 {

   execsql {

     SELECT * FROM t1 ORDER BY a;

   }

 } {1 2 3}

 do_test unique-1.7 {

   catchsql {

     INSERT INTO t1(a,b,c) VALUES(3,4,5)

   }

 } {0 {}}

 do_test unique-1.8 {

   execsql {

     SELECT * FROM t1 ORDER BY a;

   }

 } {1 2 3 3 4 5}

 integrity_check unique-1.9

 do_test unique-2.0 {

   execsql {

     DROP TABLE t1;

     CREATE TABLE t2(a int, b int);

     INSERT INTO t2(a,b) VALUES(1,2);

     INSERT INTO t2(a,b) VALUES(3,4);

     SELECT * FROM t2 ORDER BY a;

   }

 } {1 2 3 4}

 do_test unique-2.1 {

   catchsql {

     CREATE UNIQUE INDEX i2 ON t2(a)

   }

 } {0 {}}

 do_test unique-2.2 {

   catchsql {

     SELECT * FROM t2 ORDER BY a

   }

 } {0 {1 2 3 4}}

 do_test unique-2.3 {

   catchsql {

     INSERT INTO t2 VALUES(1,5);

   }

 } {1 {column a is not unique}}

 do_test unique-2.4 {

   catchsql {

     SELECT * FROM t2 ORDER BY a

   }

 } {0 {1 2 3 4}}

 do_test unique-2.5 {

   catchsql {

     DROP INDEX i2;

     SELECT * FROM t2 ORDER BY a;

   }

 } {0 {1 2 3 4}}

 do_test unique-2.6 {

   catchsql {

     INSERT INTO t2 VALUES(1,5)

   }

 } {0 {}}

 do_test unique-2.7 {

   catchsql {

     SELECT * FROM t2 ORDER BY a, b;

   }

 } {0 {1 2 1 5 3 4}}

 do_test unique-2.8 {

   catchsql {

     CREATE UNIQUE INDEX i2 ON t2(a);

   }

 } {1 {indexed columns are not unique}}

 do_test unique-2.9 {

   catchsql {

     CREATE INDEX i2 ON t2(a);

   }

 } {0 {}}

 integrity_check unique-2.10

 # Test the UNIQUE keyword as used on two or more fields.

 #

 do_test unique-3.1 {

   catchsql {

     CREATE TABLE t3(

        a int,

        b int,

        c int,

        d int,

        unique(a,c,d)

      );

   }

 } {0 {}}

 do_test unique-3.2 {

   catchsql {

     INSERT INTO t3(a,b,c,d) VALUES(1,2,3,4);

     SELECT * FROM t3 ORDER BY a,b,c,d;

   }

 } {0 {1 2 3 4}}

 do_test unique-3.3 {

   catchsql {

     INSERT INTO t3(a,b,c,d) VALUES(1,2,3,5);

     SELECT * FROM t3 ORDER BY a,b,c,d;

   }

 } {0 {1 2 3 4 1 2 3 5}}

 do_test unique-3.4 {

   catchsql {

     INSERT INTO t3(a,b,c,d) VALUES(1,4,3,5);

     SELECT * FROM t3 ORDER BY a,b,c,d;

   }

 } {1 {columns a, c, d are not unique}}

 integrity_check unique-3.5

 # Make sure NULLs are distinct as far as the UNIQUE tests are

 # concerned.

 #

 do_test unique-4.1 {

   execsql {

     CREATE TABLE t4(a UNIQUE, b, c, UNIQUE(b,c));

     INSERT INTO t4 VALUES(1,2,3);

     INSERT INTO t4 VALUES(NULL, 2, NULL);

     SELECT * FROM t4;

   }

 } {1 2 3 {} 2 {}}

 do_test unique-4.2 {

   catchsql {

     INSERT INTO t4 VALUES(NULL, 3, 4);

   }

 } {0 {}}

 do_test unique-4.3 {

   execsql {

     SELECT * FROM t4

   }

 } {1 2 3 {} 2 {} {} 3 4}

 do_test unique-4.4 {

   catchsql {

     INSERT INTO t4 VALUES(2, 2, NULL);

   }

 } {0 {}}

 do_test unique-4.5 {

   execsql {

     SELECT * FROM t4

   }

 } {1 2 3 {} 2 {} {} 3 4 2 2 {}}

 # Ticket #1301.  Any NULL value in a set of unique columns should

 # cause the rows to be distinct.

 #

 do_test unique-4.6 {

   catchsql {

     INSERT INTO t4 VALUES(NULL, 2, NULL);

   }

 } {0 {}}

 do_test unique-4.7 {

   execsql {SELECT * FROM t4}

 } {1 2 3 {} 2 {} {} 3 4 2 2 {} {} 2 {}}

 do_test unique-4.8 {

   catchsql {CREATE UNIQUE INDEX i4a ON t4(a,b)}

 } {0 {}}

 do_test unique-4.9 {

   catchsql {CREATE UNIQUE INDEX i4b ON t4(a,b,c)}

 } {0 {}}

 do_test unique-4.10 {

   catchsql {CREATE UNIQUE INDEX i4c ON t4(b)}

 } {1 {indexed columns are not unique}}

 integrity_check unique-4.99

 # Test the error message generation logic.  In particular, make sure we

 # do not overflow the static buffer used to generate the error message.

 #

 do_test unique-5.1 {

   execsql {

     CREATE TABLE t5(

       first_column_with_long_name,

       second_column_with_long_name,

       third_column_with_long_name,

       fourth_column_with_long_name,

       fifth_column_with_long_name,

       sixth_column_with_long_name,

       UNIQUE(

         first_column_with_long_name,

         second_column_with_long_name,

         third_column_with_long_name,

         fourth_column_with_long_name,

         fifth_column_with_long_name,

         sixth_column_with_long_name

       )

     );

     INSERT INTO t5 VALUES(1,2,3,4,5,6);

     SELECT * FROM t5;

   }

 } {1 2 3 4 5 6}

 do_test unique-5.2 {

   catchsql {

     INSERT INTO t5 VALUES(1,2,3,4,5,6);

   }

 } {1 {columns first_column_with_long_name, second_column_with_long_name, third_column_with_long_name, fourth_column_with_long_name, fifth_column_with_long_name, ... are not unique}}

 finish_test