開(kāi)發(fā)中遇到過(guò)問(wèn)題就是對(duì)時(shí)間以半個(gè)小時(shí)分鐘分組，如統(tǒng)計(jì)08：00-08：30的人數(shù)，08：30-09：00的人數(shù)，貌似sql中沒(méi)有這樣的函數(shù)吧，直接從數(shù)據(jù)庫(kù)里查出來(lái)，在java里分組也太low了吧
想到方法1 自定義函數(shù)，自己實(shí)現(xiàn)時(shí)間的半個(gè)小時(shí)轉(zhuǎn)換，統(tǒng)計(jì)時(shí)調(diào)用函數(shù)
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CREATE FUNCTION `date_half_hour_format`(in_date TIMESTAMP) RETURNS TIMESTAMPBEGIN DECLARE out_date TIMESTAMP; DECLARE s_date VARCHAR(255); DECLARE s_minute VARCHAR(2); DECLARE int_minute INT; SET s_minute = SUBSTRING(in_date, 15, 2); SET int_minute = CAST(s_minute AS SIGNED); IF int_minute <= 29 THEN SET int_minute = 0; SET s_date = CONCAT(LEFT(in_date, 14),'0',int_minute); ELSE SET int_minute = 30; SET s_date = CONCAT(LEFT(in_date, 14),int_minute); END IF; SET out_date = STR_TO_DATE(s_date,'%Y-%m-%d %H:%i'); RETURN out_date; END |
方法2 學(xué)過(guò)c語(yǔ)言更清楚c語(yǔ)言創(chuàng)建時(shí)間都是一個(gè)long的時(shí)間戳，可以對(duì)時(shí)間做除法運(yùn)算，就是時(shí)間long的值除以30*60，這樣就能得出半個(gè)小時(shí)的時(shí)間了，mysql中有函數(shù)unix_timestamp獲取long的時(shí)間，從long轉(zhuǎn)date的form_unixtime
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SELECT FROM_UNIXTIME((UNIX_TIMESTAMP(CURRENT_TIMESTAMP) DIV 1800)*1800) |
這樣就可以按任意時(shí)間分組了
ps：SQL Server 時(shí)間查詢(xún)
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select dateadd(dd,-day(getdate()) + 1,getdate()) '當(dāng)月起始時(shí)間' //查詢(xún)當(dāng)月起始時(shí)間select dateadd(ms,-3,DATEADD(mm, DATEDIFF(m,0,getdate())+1, 0)) '當(dāng)月結(jié)束時(shí)間' //查詢(xún)當(dāng)月結(jié)束時(shí)間select dateadd(dd,-day(dateadd(month,-1,getdate()))+1,dateadd(month,-1,getdate())) '上月起始時(shí)間' //查詢(xún)上月起始時(shí)間select dateadd(dd,-day(getdate()),getdate()) '上月結(jié)束時(shí)間' //查詢(xún)上月結(jié)束時(shí)間select dateadd(quarter,datediff(quarter,0,getdate())-1,0) as '當(dāng)前季度的上個(gè)季度初' //查詢(xún)當(dāng)前季度的上個(gè)季度開(kāi)始時(shí)間select dateadd(quarter,datediff(quarter,0,getdate()),-1) as '當(dāng)前季度的上個(gè)季度末' //查詢(xún)當(dāng)前季度的上個(gè)季度結(jié)束時(shí)間select dateadd(quarter,datediff(quarter,0,getdate()),0) as '當(dāng)前季度的第一天' //查詢(xún)當(dāng)前季度起始時(shí)間select dateadd(quarter,1+datediff(quarter,0,getdate()),-1) as '當(dāng)前季度的最后一天' //查詢(xún)當(dāng)前季度結(jié)束時(shí)間select dateadd(quarter,1+datediff(quarter,0,getdate()),0) as '當(dāng)前季度的下個(gè)季度初' //查詢(xún)當(dāng)前季度下個(gè)季度開(kāi)始時(shí)間select dateadd(quarter,2+datediff(quarter,0,getdate()),-1) as '當(dāng)前季度的下個(gè)季度末' //查詢(xún)當(dāng)前季度下個(gè)季度結(jié)束時(shí)間select dateadd(year,datediff(year,0,DATEADD(year,-1,getdate())),0) '去年的第一天' //去年的第一天select dateadd(year,datediff(year,0,getdate()),-1) '去年最后一天' //去年的最后一天select dateadd(year, datediff(year, 0, getdate()), 0) '當(dāng)年的第一天' //當(dāng)年的第一天select dateadd(year,datediff(year,0,dateadd(year,1,getdate())),-1) '當(dāng)年的最后一天' //當(dāng)年的最后一天 |
總結(jié)
以上所述是小編給大家介紹的sql中時(shí)間以5分鐘半個(gè)小時(shí)任意間隔分組的實(shí)現(xiàn)方法,希望對(duì)大家有所幫助，如果大家有任何疑問(wèn)請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)服務(wù)器之家網(wǎng)站的支持！
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原文鏈接：https://blog.csdn.net/Hendiaome/article/details/72457506
