統計報表 sql統計語句

需要資料統計頁面，肯定需要匯出資料，於是，邊學邊寫，完成了一段sql~

最早的版本是這樣的：分三條sql查出三種不同的狀態的記錄數(總記錄，未支付，已支付)

select count(*) as recordcount from t_record where createtime >= '2019-01-01 00:00:00'  and createtime < '2019-02-01 00:00:00' 

select count(*) as unpayedcount from t_record where createtime >= '2019-01-01 00:00:00'  and createtime < '2019-02-01 00:00:00' and ispayed = 0
select count(*) as payedcount from t_record where createtime >= '2019-01-01 00:00:00'  and createtime < '2019-02-01 00:00:00' and ispayed = 1

select count(*) as recordcount from t_record where createtime >= '2019-01-01 00:00:00'  and createtime < '2019-02-01 00:00:00' group by convert(createtime,date)

select count(*) as unpayedcount from t_record where createtime >= '2019-01-01 00:00:00'  and createtime < '2019-02-01 00:00:00' and ispayed = 0 group by convert(createtime,date)
select count(*) as payedcount from t_record where createtime >= '2019-01-01 00:00:00'  and createtime < '2019-02-01 00:00:00' and ispayed = 1 group by convert(createtime,date)

但是，為什麼不能一條sql查出來呢？這樣在便利性還是效能上應該都會有所提公升,能否在count帶條件或者在sum做判斷？於是，最終的sql出現了:

select 

convert(createtime,date) as recorddate,
count(*) as recordcount, 
sum(case when ispayed = 0 then 1 else 0 end) as unpayedcount,
sum(case when ispayed = 0 then 1 else 0 end) as payedcount,
from t_record 
where createtime >= '2019-01-01 00:00:00'  and createtime < '2019-02-01 00:00:00'
group by convert(createtime,date)

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