fixed tests to be independed from environment

drop table if exists t1,t2;

create table t1 (name char(20) not null, primary key (name));

create table t2 (name char(20) binary not null, primary key (name));

insert into t1 values ("");

drop table if exists t1;

create table t1 (a char(10), tmsp timestamp);

insert into t1 set a = 1;

insert delayed into t1 set a = 2;

drop table if exists t1, t2;

CREATE TABLE t1 (

id           VARCHAR(255) NOT NULL PRIMARY KEY,

sujet        VARCHAR(255),

drop table if exists t1,t2;

create table t1 (grp int, a bigint unsigned, c char(10) not null);

insert into t1 values (1,1,"a");

insert into t1 values (2,2,"b");

drop table if exists t1;

CREATE TABLE t1 (field char(1));

INSERT INTO t1 VALUES ('A'),(NULL);

SELECT * from t1 WHERE field IN (NULL);