drop table if exists t1,t2;
CREATE TABLE t1 (c int not null, d char (10) not null);
insert into t1 values(1,""),(2,"a"),(3,"b");
CREATE TEMPORARY TABLE t1 (a int not null, b char (10) not null);
insert into t1 values(4,"e"),(5,"f"),(6,"g");
alter table t1 rename t2;
select * from t1;
c	d
1	
2	a
3	b
select * from t2;
a	b
4	e
5	f
6	g
CREATE TABLE t2 (x int not null, y int not null);
alter table t2 rename t1;
select * from t1;
a	b
4	e
5	f
6	g
create TEMPORARY TABLE t2 type=heap select * from t1;
create TEMPORARY TABLE IF NOT EXISTS t2 (a int) type=heap;
CREATE TEMPORARY TABLE t1 (a int not null, b char (10) not null);
Table 't1' already exists
ALTER TABLE t1 RENAME t2;
Table 't2' already exists
select * from t2;
a	b
4	e
5	f
6	g
alter table t2 add primary key (a,b);
drop table t1,t2;
select * from t1;
c	d
1	
2	a
3	b
drop table t2;
create temporary table t1 select *,2 as "e" from t1;
select * from t1;
c	d	e
1		2
2	a	2
3	b	2
drop table t1;
drop table t1;
drop table if exists t1;
CREATE TABLE t1 (pkCrash INTEGER PRIMARY KEY,strCrash VARCHAR(255));
INSERT INTO t1 ( pkCrash, strCrash ) VALUES ( 1, '1');
SELECT CONCAT_WS(pkCrash, strCrash) FROM t1;
CONCAT_WS(pkCrash, strCrash)
1
drop table t1;
create temporary table t1 select 1 as 'x';
drop table t1;
CREATE TABLE t1 (x INT);
INSERT INTO t1 VALUES (1), (2), (3);
CREATE TEMPORARY TABLE tmp SELECT *, NULL FROM t1;
drop table t1;
create temporary table t1 (id int(10) not null unique);
create temporary table t2 (id int(10) not null primary key, 
val int(10) not null);
insert into t1 values (1),(2),(4);
insert into t2 values (1,1),(2,1),(3,1),(4,2);
select one.id, two.val, elt(two.val,'one','two') from t1 one, t2 two where two.id=one.id order by one.id;
id	val	elt(two.val,'one','two')
1	1	one
2	1	one
4	2	two
drop table t1,t2;