# 2009 February 24 # # 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 "SELECT count(*)" statements. # # $Id: count.test,v 1.6 2009/06/05 17:09:12 drh Exp $ set testdir [file dirname $argv0] source $testdir/tester.tcl # Test plan: # # count-0.*: Make sure count(*) works on an empty database. (Ticket #3774) # # count-1.*: Test that the OP_Count instruction appears to work on both # tables and indexes. Test both when they contain 0 entries, # when all entries are on the root page, and when the b-tree # forms a structure 2 and 3 levels deep. # # count-2.*: Test that # # do_test count-0.1 { db eval { SELECT count(*) FROM sqlite_master; } } {0} set iTest 0 foreach zIndex [list { /* no-op */ } { CREATE INDEX i1 ON t1(a); }] { incr iTest do_test count-1.$iTest.1 { execsql { DROP TABLE IF EXISTS t1; CREATE TABLE t1(a, b); } execsql $zIndex execsql { SELECT count(*) FROM t1 } } {0} do_test count-1.$iTest.2 { execsql { INSERT INTO t1 VALUES(1, 2); INSERT INTO t1 VALUES(3, 4); SELECT count(*) FROM t1; } } {2} do_test count-1.$iTest.3 { execsql { INSERT INTO t1 SELECT * FROM t1; -- 4 INSERT INTO t1 SELECT * FROM t1; -- 8 INSERT INTO t1 SELECT * FROM t1; -- 16 INSERT INTO t1 SELECT * FROM t1; -- 32 INSERT INTO t1 SELECT * FROM t1; -- 64 INSERT INTO t1 SELECT * FROM t1; -- 128 INSERT INTO t1 SELECT * FROM t1; -- 256 SELECT count(*) FROM t1; } } {256} do_test count-1.$iTest.4 { execsql { INSERT INTO t1 SELECT * FROM t1; -- 512 INSERT INTO t1 SELECT * FROM t1; -- 1024 INSERT INTO t1 SELECT * FROM t1; -- 2048 INSERT INTO t1 SELECT * FROM t1; -- 4096 SELECT count(*) FROM t1; } } {4096} do_test count-1.$iTest.5 { execsql { BEGIN; INSERT INTO t1 SELECT * FROM t1; -- 8192 INSERT INTO t1 SELECT * FROM t1; -- 16384 INSERT INTO t1 SELECT * FROM t1; -- 32768 INSERT INTO t1 SELECT * FROM t1; -- 65536 COMMIT; SELECT count(*) FROM t1; } } {65536} } proc uses_op_count {sql} { if {[lsearch [execsql "EXPLAIN $sql"] Count]>=0} { return 1; } return 0 } do_test count-2.1 { execsql { CREATE TABLE t2(a, b); } uses_op_count {SELECT count(*) FROM t2} } {1} do_test count-2.2 { catchsql {SELECT count(DISTINCT *) FROM t2} } {1 {near "*": syntax error}} do_test count-2.3 { uses_op_count {SELECT count(DISTINCT a) FROM t2} } {0} do_test count-2.4 { uses_op_count {SELECT count(a) FROM t2} } {0} do_test count-2.5 { uses_op_count {SELECT count() FROM t2} } {1} do_test count-2.6 { catchsql {SELECT count(DISTINCT) FROM t2} } {1 {DISTINCT aggregates must have exactly one argument}} do_test count-2.7 { uses_op_count {SELECT count(*)+1 FROM t2} } {0} do_test count-2.8 { uses_op_count {SELECT count(*) FROM t2 WHERE a IS NOT NULL} } {0} do_test count-2.9 { catchsql {SELECT count(*) FROM t2 HAVING count(*)>1} } {1 {a GROUP BY clause is required before HAVING}} do_test count-2.10 { uses_op_count {SELECT count(*) FROM (SELECT 1)} } {0} do_test count-2.11 { execsql { CREATE VIEW v1 AS SELECT 1 AS a } uses_op_count {SELECT count(*) FROM v1} } {0} do_test count-2.12 { uses_op_count {SELECT count(*), max(a) FROM t2} } {0} do_test count-2.13 { uses_op_count {SELECT count(*) FROM t1, t2} } {0} ifcapable vtab { register_echo_module [sqlite3_connection_pointer db] do_test count-2.14 { execsql { CREATE VIRTUAL TABLE techo USING echo(t1); } uses_op_count {SELECT count(*) FROM techo} } {0} } do_test count-3.1 { execsql { CREATE TABLE t3(a, b); SELECT a FROM (SELECT count(*) AS a FROM t3) WHERE a==0; } } {0} do_test count-3.2 { execsql { SELECT a FROM (SELECT count(*) AS a FROM t3) WHERE a==1; } } {} do_test count-4.1 { execsql { CREATE TABLE t4(a, b); INSERT INTO t4 VALUES('a', 'b'); CREATE INDEX t4i1 ON t4(b, a); SELECT count(*) FROM t4; } } {1} do_test count-4.2 { execsql { CREATE INDEX t4i2 ON t4(b); SELECT count(*) FROM t4; } } {1} do_test count-4.3 { execsql { DROP INDEX t4i1; CREATE INDEX t4i1 ON t4(b, a); SELECT count(*) FROM t4; } } {1} finish_test