项目有用到过的sql
1、合并多行数据,逗号隔开(GROUP_CONCAT)
SELECT s.*,p.* from s_productandbrand s
LEFT JOIN
(SELECT ss.productID,GROUP_CONCAT(sp.`name`) as brandNames,GROUP_CONCAT(sp.itemID) as brandIds
from s_pbref ss
LEFT JOIN s_productandbrand sp on ss.brandID = sp.itemID
GROUP BY ss.productID) p on s.itemID = p.productID
where 1 = 1
insert into s_msg(msgTypeID,userType,userID,orderID,createTime,visible,`desc`,state)
SELECT 1,1,1,0,NOW(),{2},'xx',1
FROM u_users where type = 1 and `enable` = 1
批量新增数据2()
insert into persons
(id_p, lastname , firstName, city )
values
(200,'haha' , 'deng' , 'shenzhen'),
(201,'haha2' , 'deng' , 'GD'),
(202,'haha3' , 'deng' , 'Beijing');
3、批量更新数据
UPDATE s_configmoney a
LEFT JOIN s_configmoney b on a.producterID = b.producterID and a.brandID = b.brandID and a.repairTypeID = b.repairTypeID and a.repairMaterial = b.repairMaterial
set a.designerMoney = b.designerMoney, a.designVerifyMoney = b.designVerifyMoney,a.producterMoney = b.producterMoney,a.state = b.state
where a.visible = 1 and a.producterID = {0} and b.visible=2
4、排序
ORDER BY if(oo.state=8,0,1),createtime desc
5、查询判断(select if)
SELECT if(job='boss','good','bad') as 'a' FROM `job`
'6、left join 最新的表数据优化
LEFT JOIN (SELECT * FROM o_task WHERE taskID in (SELECT MAX(taskID) FROM o_task GROUP BY orderID )) ot on ot.orderID = o1.orderID
LEFT JOIN (SELECT MAX(taskID) as taskID,orderID FROM o_task GROUP BY orderID ) ot1 on ot1.orderID = o1.orderID
LEFT JOIN o_task ot on ot.taskID = ot1.taskID
7:查询合并列数据GROUP_CONCAT
SELECT ss.productID,GROUP_CONCAT(sp.`name`) as brandNames,GROUP_CONCAT(sp.itemID) as brandIds ,GROUP_CONCAT(rt.`name`) as repairTypes
,GROUP_CONCAT(rm.`name`) as repairMaterials,GROUP_CONCAT(rt.itemID) as repairTypeIds ,GROUP_CONCAT(rm.itemID) as repairMaterialIds
from s_pbref ss
LEFT JOIN s_productandbrand sp on sp.visible = 1 and ss.brandID = sp.itemID
LEFT JOIN s_repairmaterial rm on rm.visible = 1 and ss.repairMaterialID = rm.itemID
LEFT JOIN s_repairtype rt on rt.visible = 1 and ss.repairTypeID = rt.itemID
GROUP BY ss.productID
7.1、按区域统计 (按12小时时间差统计)
select count(1) as count,(((diffHour - 1) div 12 + 1) * 12) as bttiem FROM (SELECT er.repairID,if(ec.receiverID >0,ec.receiverID,ec.userID) as repairUserID,convert(TIMESTAMPDIFF(HOUR,er.createTime,ec.createTime),SIGNED) as diffHour FROM eq_repair er LEFT JOIN eq_record ec on er.repairID = ec.repairID and ec.recordType = 20 where ec.itemID >0 ORDER BY diffHour ) A where a.diffHour < 72 GROUP BY (a.diffHour -1) div 12 + 1
8:关于mysql查询最近一条记录
中策——查询排序后group by
select * from (
select * from a
where time<="2017-03-29 19:30:36"
order by time desc
) group by user_id
后来发现使用group by 可以根据group by 的参数列分组,但返回的结果只有一条,仔细观察发现group by是将分组后的第一条记录返回。时间在查询后默认是顺序排列,因此需要先将时间倒序排列,方可取出距离当前最近一条。
这样查询实际上还是进行了两次查询,虽然时间上相比第一个方法有了质的飞跃,但是还可以进一步优化。
上策——将max() 方法和group by结合使用
select *,max(time) from a
where time<="2017-03-29 19:30:36"
group by user_id
这句可以理解为将结果集根据user_id分组,每组取time最大一条记录。这样就很好的实现了批量查询最近记录,并且仅仅需要遍历一次表,即使在数据量巨大的情况下也可以在很短的时间查出结果。
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mysql 查询今天、昨天、上月、本月的数据
今天
select * from 表名 where to_days(时间字段名) = to_days(now());
昨天
SELECT * FROM 表名 WHERE TO_DAYS( NOW( ) ) - TO_DAYS( 时间字段名) <= 1
7天
SELECT * FROM 表名 where DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date(时间字段名)
近30天
SELECT * FROM 表名 where DATE_SUB(CURDATE(), INTERVAL 30 DAY) <= date(时间字段名)
本月
SELECT * FROM 表名 WHERE DATE_FORMAT( 时间字段名, '%Y%m' ) = DATE_FORMAT( CURDATE( ) , '%Y%m' )
上一月
SELECT * FROM 表名 WHERE PERIOD_DIFF( date_format( now( ) , '%Y%m' ) , date_format( 时间字段名, '%Y%m' ) ) =1
#查询本季度数据
select * from `ht_invoice_information` where QUARTER(create_date)=QUARTER(now());
#查询上季度数据
select * from `ht_invoice_information` where QUARTER(create_date)=QUARTER(DATE_SUB(now(),interval 1 QUARTER));
#查询本年数据
select * from `ht_invoice_information` where YEAR(create_date)=YEAR(NOW());
#查询上年数据
select * from `ht_invoice_information` where year(create_date)=year(date_sub(now(),interval 1 year));
查询当前这周的数据
SELECT name,submittime FROM enterprise WHERE YEARWEEK(date_format(submittime,'%Y-%m-%d')) = YEARWEEK(now());
查询上周的数据
SELECT name,submittime FROM enterprise WHERE YEARWEEK(date_format(submittime,'%Y-%m-%d')) = YEARWEEK(now())-1;
查询当前月份的数据
select name,submittime from enterprise where date_format(submittime,'%Y-%m')=date_format(now(),'%Y-%m')
查询距离当前现在6个月的数据
select name,submittime from enterprise where submittime between date_sub(now(),interval 6 month) and now();
查询上个月的数据
select name,submittime from enterprise where date_format(submittime,'%Y-%m')=date_format(DATE_SUB(curdate(), INTERVAL 1 MONTH),'%Y-%m')
select * from ` user ` where DATE_FORMAT(pudate, ' %Y%m ' ) = DATE_FORMAT(CURDATE(), ' %Y%m ' ) ;
select * from user where WEEKOFYEAR(FROM_UNIXTIME(pudate,'%y-%m-%d')) = WEEKOFYEAR(now())
select *
from user
where MONTH (FROM_UNIXTIME(pudate, ' %y-%m-%d ' )) = MONTH (now())
select *
from [ user ]
where YEAR (FROM_UNIXTIME(pudate, ' %y-%m-%d ' )) = YEAR (now())
and MONTH (FROM_UNIXTIME(pudate, ' %y-%m-%d ' )) = MONTH (now())
select *
from [ user ]
where pudate between 上月最后一天
and 下月第一天
where date(regdate) = curdate();
select * from test where year(regdate)=year(now()) and month(regdate)=month(now()) and day(regdate)=day(now())
SELECT date( c_instime ) ,curdate( )
FROM `t_score`
WHERE 1
LIMIT 0 , 30