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drop table if exists t1,t2;
create table t1 (a int);
select count(a) as b from t1 where a=0 having b > 0;
b
insert into t1 values (null);
select count(a) as b from t1 where a=0 having b > 0;
b
select count(a) as b from t1 where a=0 having b >=0;
b
0
explain extended select count(a) as b from t1 where a=0 having b >=0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Warnings:
Note 1003 select count(test.t1.a) AS `b` from test.t1 where (test.t1.a = 0) having (count(test.t1.a) >= 0)
drop table t1;
CREATE TABLE t1 (
raw_id int(10) NOT NULL default '0',
chr_start int(10) NOT NULL default '0',
chr_end int(10) NOT NULL default '0',
raw_start int(10) NOT NULL default '0',
raw_end int(10) NOT NULL default '0',
raw_ori int(2) NOT NULL default '0'
);
INSERT INTO t1 VALUES (469713,1,164123,1,164123,1),(317330,164124,317193,101,153170,1),(469434,317194,375620,101,58527,1),(591816,375621,484273,1,108653,1),(591807,484274,534671,91,50488,1),(318885,534672,649362,101,114791,1),(318728,649363,775520,102,126259,1),(336829,775521,813997,101,38577,1),(317740,813998,953227,101,139330,1),(1,813998,953227,101,139330,1);
CREATE TABLE t2 (
id int(10) unsigned NOT NULL default '0',
contig_id int(10) unsigned NOT NULL default '0',
seq_start int(10) NOT NULL default '0',
seq_end int(10) NOT NULL default '0',
strand tinyint(2) NOT NULL default '0',
KEY id (id)
);
INSERT INTO t2 VALUES (133195,469713,61327,61384,1),(133196,469713,64113,64387,1),(133197,1,1,1,0),(133197,1,1,1,-2);
SELECT e.id,
MIN( IF(sgp.raw_ori=1,
(e.seq_start+sgp.chr_start-sgp.raw_start),
(sgp.chr_start+sgp.raw_end-e.seq_end))) as start,
MAX( IF(sgp.raw_ori=1,
(e.seq_end+sgp.chr_start-sgp.raw_start),
(sgp.chr_start+sgp.raw_end-e.seq_start))) as end,
AVG(IF (sgp.raw_ori=1,e.strand,(-e.strand))) as chr_strand
FROM t1 sgp,
t2 e
WHERE sgp.raw_id=e.contig_id
GROUP BY e.id
HAVING chr_strand= -1 and end >= 0
AND start <= 999660;
id start end chr_strand
133197 813898 813898 -1.0000
drop table t1,t2;
CREATE TABLE t1 (Fld1 int(11) default NULL,Fld2 int(11) default NULL);
INSERT INTO t1 VALUES (1,10),(1,20),(2,NULL),(2,NULL),(3,50);
select Fld1, max(Fld2) as q from t1 group by Fld1 having q is not null;
Fld1 q
1 20
3 50
select Fld1, max(Fld2) from t1 group by Fld1 having max(Fld2) is not null;
Fld1 max(Fld2)
1 20
3 50
select Fld1, max(Fld2) from t1 group by Fld1 having avg(Fld2) is not null;
Fld1 max(Fld2)
1 20
3 50
select Fld1, max(Fld2) from t1 group by Fld1 having std(Fld2) is not null;
Fld1 max(Fld2)
1 20
3 50
select Fld1, max(Fld2) from t1 group by Fld1 having variance(Fld2) is not null;
Fld1 max(Fld2)
1 20
3 50
drop table t1;
create table t1 (id int not null, qty int not null);
insert into t1 values (1,2),(1,3),(2,4),(2,5);
select id, sum(qty) as sqty from t1 group by id having sqty>2;
id sqty
1 5
2 9
select sum(qty) as sqty from t1 group by id having count(id) > 0;
sqty
5
9
select sum(qty) as sqty from t1 group by id having count(distinct id) > 0;
sqty
5
9
drop table t1;
CREATE TABLE t1 (
`id` bigint(20) NOT NULL default '0',
`description` text
) ENGINE=MyISAM;
CREATE TABLE t2 (
`id` bigint(20) NOT NULL default '0',
`description` varchar(20)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1, 'test');
INSERT INTO t2 VALUES (1, 'test');
CREATE TABLE t3 (
`id` bigint(20) NOT NULL default '0',
`order_id` bigint(20) NOT NULL default '0'
) ENGINE=MyISAM;
select
a.id, a.description,
count(b.id) as c
from t1 a left join t3 b on a.id=b.order_id
group by a.id, a.description
having (a.description is not null) and (c=0);
id description c
1 test 0
select
a.*,
count(b.id) as c
from t2 a left join t3 b on a.id=b.order_id
group by a.id, a.description
having (a.description is not null) and (c=0);
id description c
1 test 0
INSERT INTO t1 VALUES (2, 'test2');
select
a.id, a.description,
count(b.id) as c
from t1 a left join t3 b on a.id=b.order_id
group by a.id, a.description
having (a.description is not null) and (c=0);
id description c
1 test 0
2 test2 0
drop table t1,t2,t3;
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (3), (4), (1), (3), (1);
SELECT SUM(a) FROM t1 GROUP BY a HAVING SUM(a)>0;
SUM(a)
2
6
4
SELECT SUM(a) FROM t1 GROUP BY a HAVING SUM(a);
SUM(a)
2
6
4
DROP TABLE t1;
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (1), (2), (1), (3), (2), (1);
SELECT a FROM t1 GROUP BY a HAVING a > 1;
a
2
3
SELECT a FROM t1 GROUP BY a HAVING 1 != 1 AND a > 1;
a
SELECT 0 AS x, a FROM t1 GROUP BY x,a HAVING x=1 AND a > 1;
x a
EXPLAIN SELECT a FROM t1 GROUP BY a HAVING 1 != 1 AND a > 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible HAVING
EXPLAIN SELECT 0 AS x, a FROM t1 GROUP BY x,a HAVING x=1 AND a > 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible HAVING
DROP table t1;
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