if exists should not be used inside test

removed influence of some tests on other tests

mysql-test/r/multi_update.result

@@ -446,6 +446,7 @@ grant update on mysqltest.t1 to mysqltest_1@localhost;
 update t1, t2 set t1.b=1 where t1.a=t2.a;
 update t1, t2 set t1.b=(select t3.b from t3 where t1.a=t3.a) where t1.a=t2.a;
 revoke all privileges on mysqltest.t1 from mysqltest_1@localhost;
+revoke all privileges on mysqltest.* from mysqltest_1@localhost;
 delete from mysql.user where user='mysqltest_1';
 drop database mysqltest;
 create table t1 (a int, primary key (a));

mysql-test/r/subselect.result

@@ -334,7 +334,7 @@ Note	1276	Field or reference 'clinic_uq' of SELECT #2 was resolved in SELECT #1
 Note	1003	select test.t6.patient_uq AS `patient_uq`,test.t6.clinic_uq AS `clinic_uq` from test.t6 where exists(select test.t7.uq AS `uq`,test.t7.name AS `name` from test.t7 where (test.t7.uq = test.t6.clinic_uq))
 select * from t1 where a= (select a from t2,t4 where t2.b=t4.b);
 ERROR 23000: Column: 'a' in field list is ambiguous
-drop table if exists t1,t2,t3;
+drop table t1,t2,t3;
 CREATE TABLE t3 (a varchar(20),b char(1) NOT NULL default '0');
 INSERT INTO t3 VALUES ('W','a'),('A','c'),('J','b');
 CREATE TABLE t2 (a varchar(20),b int NOT NULL default '0');

mysql-test/t/multi_update.test

@@ -404,6 +404,7 @@ update t1, t2 set t1.b=1 where t1.a=t2.a;
 update t1, t2 set t1.b=(select t3.b from t3 where t1.a=t3.a) where t1.a=t2.a;
 connection root;
 revoke all privileges on mysqltest.t1 from mysqltest_1@localhost;
+revoke all privileges on mysqltest.* from mysqltest_1@localhost;
 delete from mysql.user where user='mysqltest_1';
 drop database mysqltest;
 

mysql-test/t/subselect.test

@@ -135,7 +135,7 @@ explain extended select * from t6 where exists (select * from t7 where uq = clin
 select * from t1 where a= (select a from t2,t4 where t2.b=t4.b);
 
 # different tipes & group functions
-drop table if exists t1,t2,t3;
+drop table t1,t2,t3;
 
 CREATE TABLE t3 (a varchar(20),b char(1) NOT NULL default '0');
 INSERT INTO t3 VALUES ('W','a'),('A','c'),('J','b');

mysql-test/t/system_mysql_db_fix.test

@@ -74,5 +74,9 @@ DROP TABLE user;
 DROP TABLE func;
 DROP TABLE tables_priv;
 DROP TABLE columns_priv;
+DROP TABLE help_category;
+DROP TABLE help_keyword;
+DROP TABLE help_relation;
+DROP TABLE help_topic;
 
 -- enable_query_log