sql server fuzzy string comparison

Tags: style class code C TAR extIn SQL Server, where fuzzy matching strings are often used, the simplest way is to use the LIKE keyword (like syntax http://msdn.microsoft.com/en-us/library/ms179859.aspx). But if we use the method of adding percent before and after, there is no way to use the index for fast query, so in many cases we use the left matching way. The

The Oracle tutorial being looked at is the comparison of Oracle and SQL Server in enterprise applications. The company I serve not only has an Oracle database, but also has a SQL Server database, so I often meet people asking me two questions. The first type is usually "can

Usage scenarios:For example, you need to query all student numbers with scores greater than 95, separated by commas into a string, from the Student score table.To prepare the test data:CREATE TABLE score (ID int,score int)INSERT into score values (1,90)INSERT into score values (2,96)INSERT into score values (3,99)It is now necessary to query the result string "2,,3" with a single statement.The

Reproduced in: http://www.2cto.com/database/201206/137067.html Comparison of SQL Server left Join,right join and inner join today to look at the database left join,Right join and INNER join the difference between the three people on the Internet to read the written source code, the vast majority of application system development, the database will have a lot of v

CategoryID, PATINDEX ('%candies% ', Description) as POSITION From Categories WHERE PATINDEX ('%candies% ', Description) Hope to be useful to everyone. If the above still does not understand, you can continue to look down: First, [SQL] patindex detailed explanation [Z] PATINDEX Returns the starting position of the first occurrence of a pattern in the specified expression, or zero if the pattern is not found in all valid text and character

ind_emp; Create index ind_emp on EMP (empno) cluster; Create index ind_emp on EMP (empno,ename); Unique Clustered index: Drop Index ind_emp;--There can be only one clustered index on a table. Create Unique index ind_sal on u_emp (SAL) cluster; Build a clustered index. To build an index on Oracle: Sql> CREATE INDEX IND1 on EMP (MGR); Btree index. Sql> CREATE INDEX Ind2 on EMP (DEPTNO) reverse; Reverse index

Recently in the writing of a project, using the time of comparison and time of the addition and subtraction, here briefly, I was just contact with the database soon, if there are said improper place to hope that you forgive, correct meA comparison of timeIn the beginning, I spent more time with time>getdate () simple roughIn fact, SQL

There are three keywords in SQL Server that can modify comparison operators: All, any, and some, where some and any are equivalent. The official reference document http://technet.microsoft.com/zh-cn/library/ms187074%28sql.90%29.aspx They work between comparison operators and subqueries, The function is similar to

time 3523.2 ms　　　　Four. SummarizeYou can see that the larger the amount of data, the larger the paging page number, the greater the impact on paging efficiency. Top of the page method out early, it is obviously because the data in the not too large, so if there is a good top paging method can leave a message below, I will also test. Row_number page method is relatively good, and sql2005 and above the database can be used, the audience range is larger, and the offset fecth performance is more su

After a problem, the moment to solve the problem, there is always a strong sense of achievement. In the previous project, the background database used SQL Server, and the time comparison SQL was simple, which is generally the following form: select * from table where time New project, the backstage use Oracle, just

In SQL Server database operations, we often use stored procedures to implement the query data paging to facilitate the browsing of the viewer. To create a database data_test: Create DATABASE data_test go use data_test go create table tb_testtable --Creating Tables ( ID int Identity (1,1) primary key, userName nvarchar not null, userpwd nvarchar (.) not NULL, UserEmail nvarchar () nul

Tags: typeid now () time use where Server pen table name notationQuery the first 100 data #mysql Select * from - ; #sqlserver Selecttop* from table_name; From the database. Table Positioning table #mysql写法: library name. Table name Select from where userName='boss' #Sqlserver写法: library name. dbo. Table name; or: library name. Table name (note: Use two points in the middle )Selectfromwhere userName=' Boss' Get time MySQL notation: now ()

Original article: http://blog.csdn.net/ylqmf/article/details/4972034 Method 1 Write a function -- String comparison functions that are case sensitive to stringsCreate function [dbo]. [StrComp] (@ Str1 NVARCHAR (50), @ Str2 NVARCHAR (50 ))Returns integer--1 is equal, and its return value is not equal.ASBEGINDeclare @ hashcode1 varbinary (32)Declare @ hashcode2 varbinary (32)Declare @ result int Select @ has

certain impact Log shipping Whether Yes (read only) N Library Whether UNC way to access Replica library disconnects connected users when doing resotre/may affect regular log backups Publish a subscription Is Yes (read and write, but write may result in inconsistent data) N Table (query) Is Domain/non-domain When there is a large number of DML operations on the main library , there is a certain imp

The SQL Server. NET Data Provider Connection string contains a collection of property name/value pairs. Each attribute/value pair is separated by a semicolon.propertyname1=value1; Propertyname2=value2; Propertyname3=value3;Similarly, the connection string must contain the SQL