2000-10-10	1
2000-10-10	2
2100-10-10	3
2100-10-10	4
2000-10-11 00:00:00	2000-10-11 00:00:00
2000-10-11 00:00:00	2000-10-11 00:00:00
2100-10-11 00:00:00	2100-10-11 00:00:00
2100-10-11 00:00:00	2100-10-11 00:00:00
2100-10-10	3
2100-10-10	4
=============
1	a
2	b
3	c
4	d
2000-01-01 00:00:00	2100-01-01 00:00:00
1	a
3	c
=============
1	a
3	c
2000-01-01 00:00:00	2000-01-01 00:00:00
=============
1	a
2	b
3	c
4	d
1	a
2	
3	c
4	
=============
1	a
2	
3	c
4	
1	
2	
3	
4	
=============
1	a
2	b
3	c
4	d
2000-01-01 00:00:00	2100-01-01 00:00:00
1	a
2	b
4	d
=============
1	a
2	b
4	d
1	
2	
4	d
=============
1	a	aa
2	b	bb
3	c	cc
4	d	dd
1	a	
2	b	bb
3		cc
4	d	
1
=============
0