In this post, we’ll take you on a SQL date range trip. You’ll understand what “SQL date range” means, the value it brings to your database querying, and how to use it to your benefit. We’ll open by covering some prerequisites to make sure we’re on the same page and ready ...
SELECTDEPT_CODE FROM DEPT ORDER BY DEPT_TYPE; EXPLAIN PLAN: SORT ORDER BY TABLE ACCESS FULL 高效:(使用索引) SELECT DEPT_CODE FROM DEPT WHERE DEPT_TYPE > 0; EXPLAIN PLAN: TABLE ACCESS BY ROWID ON EMP INDEX RANGE SCAN ON DEPT_IDX ORDER BY 也能使用索引! 这的确是个容易被忽视的知识点. ...
insert into order(id,code,user_id) values(123,'001',100);该操作需要多次请求数据库，才能完成...
WeekRange([Date], [StartDateTime], [EndDateTime]) AS ( SELECT [Date], DATEADD(DAY, -(DATEPART(WEEKDAY, [Date])-1), _ DATEADD(DAY, DATEDIFF(DAY, 0, [Date]), 0)), DATEADD(DAY, 7-(DATEPART(WEEKDAY, [Date])), _ DATEADD(SECOND, -1, DATEADD(DAY, DATEDIFF(DAY, 0, [Date]) +...
['code'=>0,'message'=>'搜索无结果','data'=>[]]);}$eleInfoWhere=['element_id'=>['in',$eleIds]];$eleInfoIds=ElementInfoModel::getInstance()->where($eleInfoWhere)->getField('id',true);if(empty($eleInfoIds)){$this->ajaxReturn(['code'=>0,'message'=>'搜索无结果','data'=>...
1、通过执行计划看看使用 WHERE ORDER_CREATE_TIME >= DATE_SUB(SYSDATE(),INTERVAL 7 DAY) 的情况。 发现是 type 是index(type扫描方式由快到慢 system > const > eq_ref > ref > range > index > all ) index类型,需要扫描索引上的全部数据,它仅比全表扫描快一点 ...
# 来自https://www.bejson.com/runcode/sql/selectPersonIDID,City城市fromPersonwherePersonID=1; 一般的教程好像都没看到,搜也不知道关键词是什么。我实在弄不清,只好去问组长——原来是给字段起别名。 -- SQL不区分换行和大小写,“--”和“#”都是单行注释SELECT-- 表头别名3.字段1as别名1,-- 如果数...
Date range 1753-01-01 (January 1, 1753) through 9999-12-31 (December 31, 9999) Time range 00:00:00 through 23:59:59.997 Time zone offset range None Element ranges yyyy is four digits from 1753 through 9999 that represent a year.MM is two digits, ranging from 01 to 12, that represe...
[pf_range_fact] ALL TO ([PRIMARY]); GO CREATE TABLE fact_sales(date_id int, product_id int, store_id int, quantity int, unit_price numeric(7,2), other_data char(1000)) ON ps_fact_sales(date_id); GO CREATE CLUSTERED INDEX ci ON fact_sales(date_id); GO PRINT 'Loading...';...
CREATESCHEMAAudit; GOCREATESEQUENCEAudit.EventCounterASINTSTARTWITH1INCREMENTBY1; GOCREATETABLEAudit.ProcessEvents ( EventIDINTDEFAULT(NEXTVALUEFORAudit.EventCounter) PRIMARYKEYCLUSTERED, EventTime DATETIMEDEFAULT(getdate())NOTNULL, EventCodeNVARCHAR(5)NOTNULL, DescriptionNVARCHAR(300)NULL); GOCREATETABLEAudi...