sql query with nolock

Hibernate native SQL query, Hibernate native SQL Recently, a more complex query was made, and the basic query of hibernate could not meet the requirements. Therefore, we had to use the native SQL

SQL subquery, multi-Table query, and joint Query Subquery, multi-Table query, and joint QueryThese three concepts are interpreted slightly differently in different SQL versions, roughly as follows: JoinYou can check related SQL

Introduction to the Decode () function:Main role: Translation of query results into other values (that is, in other forms of expression, the following examples);How to use:Select decode (ColumnName, value 1, translation value 1, value 2, translation value 2,... Value n, translation value n, default value)From TalbenameWhere ...Where ColumnName is the column defined in the table to be selected,• Explanation of Meaning:Decode (condition, value 1, transl

I wrote a half-day SQL statement in the query analyzer and forgot to save it ~ What should I do if I want to retrieve an SQL statement that has been executed for a certain period of time? I wrote a half-day SQL statement in the query analyzer and forgot to save it ~ What sho

Tags: that is greater than stronggrouplov in insert get address When we want to query all result sets in SQL for which a column value is NULL, the query condition should write like thisSELECT * FROM table where field is nullInstead, use the SELECT * from table where field = NULL to not find the correct result. Then why is this? To understand why, you need to

Label:--sal for employee wagesSELECT * from EMP;--Inquire about employee information in the [1500,3000] range of wagesSELECT * from emp where Sal >= and Sal SELECT * from EMP where Sal between and 3000;--The above two sentences have the same effect--Query employee information for wages less than 1500 or greater than 3000SELECT * from emp where Sal SELECT * from emp where Sal is not between and 3000;--The above two sentences have the same effect--

longitude and latitude two columns in the data table to optimize the speed at which the where statement executes.The final SQL statement is as follows 1 $sql=‘select * from users_location where 2 latitude >‘.$lat.‘-1and 3 latitude ‘.$lat.‘+1and 4 longitude >‘.$lon.‘-1and

An interesting SQL queryA friend has such a SQL query requirement:There is a login table (Tmp_test) that contains the user ID (UID) and logon time (Login_time). The table structure is as follows:*************************** 1. Row***************************Field:uidtype:int(Ten) unsignedNull: NOKey: MULDefault:NULLExtra:*************************** 2. Row**********

Source: http://www.cnblogs.com/doosmile/archive/2012/03/16/2400646.html--Connect remote SQL or insert data with OPENROWSET--if it's just temporary access, you can use OPENROWSET directly--query ExampleSELECT * FROM OPENROWSET (' SQLOLEDB ', ' SQL Server name '; ' User name '; ' Password, database name. dbo. Table name)You need to enable AD HOC distributed for cro

Memory:4gos:windows2003database: MS SQL Server -Purpose: Query performance test to compare performance SQL query efficiency for two queries step by step--SETP1.--Build Tables CREATE TABLE T_userinfo (useridintIdentity1,1) Primary key Nonclustered,nick varchar ( -) notNULL default "', ClassIDintNotNULL default 0, Writet

Label:SELECT B.deptname,A.badgenumber,A.userid,A.SSN,A.nameFROM dbo. USERINFO AINNER JOIN dbo. Departments B on a.defaultdeptid = B.deptidWHERE A.SSN is not NULLAnd b.deptid like '% ' Table ' USERINFO '. Scan count 1, logic read 278 times, physical read 0 times, pre-read 0 times.Table ' departments '. Scan count 1, logic read 4 times, physical read 0 times, pre-read 0 times. SQL Server Execution Time:CPU time = 15 milliseconds, time-consuming = 54 mil

Php:It is usually the beginning of the code you want to check to record a time, the end of the record a time. Take the difference value,the efficiency of database SQLSQL explain (MySQL), enable slow query log to record slow queries. Usually also depends on the database design is reasonable, the demand is reasonable and so on.But this time is generally very fast, in less than a second, so you can not directly use mktime ()function Getmicrotime () {Lis

http://blog.csdn.net/sxdtzhaoxinguo/article/details/51481430Abstract: MySQL database implementation of paged query SQL statement writing!One: Paging needs:The client passes the start (page number), limit (number of bars per page) two parameters to page through the data in the database table, then we know that the MySQL database provides paging function limit m,n, but the use of this function is different fr

Q A location: http://space.cnblogs.com/q/20546/q A: I have asked more questions about the relationship: 5 [resolved issues] Browse: 52 times 00 Student table T1 Stu_id Stu_name 1 Zhang San 2 Li Si 3 Wang Wu Course list T2 Co_id Co_name 1 Java 2 C # 3 C 4 C ++ 5 Javascript Link Table T3 Stu_id Co_id 1 1 1 4 2 1

Label: CREATE VIEW View_1--Create a new view name as--functions for building viewsSelectStudent.sno,sname,cno,degree fromStudent join score on student.sno=Score.sno GoSelect* fromView_1wheresno='1' Select* from (SelectStudent.sno,sname,cno,degree fromStudent join score on STUDENT.SNO=SCORE.SNO) asTable2 wheresno='101'--define as a temporary table with AS and then query the results from the table. is also a sub-qu