compare two columns in sql

Label:Results that are queried for different conditions are displayed on the same lineTry to write over using "," and inner join two ways to feel more intuitive using ","Select Table1.guid, table1.content name, table2.content sex, table3.content age from ( select GUID, Content from table where type= ' name ' ) table1 , ( Select GUID, content from table where type= ' sex ' ) table2 , ( Select GUID, content from table where type= ' age ' ) Table3 where Table1.guid = Table2.guid and table2.guid =

Label:You can add a new column to a table by using the ALTER keyword. Like what: Add a column to the table for persons with the name birthday, and the type is date. ALTER TABLE Persons ADD Birthday Date The format for using ALTER is: ALTER TABLE table_name ADD column_name datatype The action to delete a column in a table is: ALTER TABLE table_name DROP COLUMN column_name To change the properties of a column: ALTER TABLE table_name ALTER COLUMN column_name datatype Reference: http://www.w3s

1: Three ways to build a tableBuilding a table will only create a table in the library and display it in the log, and there will be no output.1.1: Define columns yourself to create an empty tableColumn-specification = column-define + column-constriants + message=/msgtypeData in SAS is stored in only two ways, one char (n), and one Num. SAS also supports SQL native data types, but will eventually be translat

Tags: compute Ros man Date Judge Special One create MicThe computed column differs from the column that requires us to assign the value manually or by the program, whose value is derived from the computed value of the other columns in the table. For example, if a table contains a quantity column number and a price column, we can create a calculated column amount amount to represent the result value of the quantity * unit price, and after the amount co

Tags: exe code ima define BLE multi-column class statement DECLARE @c CHARACTER ( -)/* Declaration column */DECLARE @NUM INT/* declaration creates the specified number of rows */DECLARE @sql CHARACTER ( -)/* Declares the Execute SQL statement */SET @NUM=10/* Defined as 10 columns * /While (@NUM>0) BEGIN SET @c= CONVERT (CHARACTER (Ten), @NUM)/* Set column * /Set

SQL alert commands are used to modify data table names, add columns, delete columns, modify field data types, and so on. All right, let's take a look at the example below. Database ALTER TABLE syntaxTo add a column to a table, use the following syntax: ALTER TABLE table_name ADD column_name datatype Let's look at an example of an additional example: Al

Tags: parse SSO research target category SDN condition development Query in the process of reporting for the Bureau of Personnel, encountered a thorny problem. Customer requests that a column of data in a database be divided into multiple columns according to the criteria. For example, there are provinces in the database that have such a column of data Customer requirements are categorized according to the province. A column of Hebei province, a row

Tags: sql1. The original table test structure is as follows:650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/57/16/wKiom1SRCDyj_Is1AABlHsTZB-k835.jpg "title=" 1.png " alt= "Wkiom1srcdyj_is1aablhstzb-k835.jpg"/>2. The result we want to get is:650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/57/16/wKiom1SRCIjyYmdnAABBtb-3S3Q100.jpg "title=" 2.png " alt= "Wkiom1srcijyymdnaabbtb-3s3q100.jpg"/>3, the first method: Static method, that is, column fixedSQL is as follows:SELECT * FROM

', ' 192.168.0.67 '; Sa '; ' Password ', ' SELECT * from BCM2.dbo.tbAppl ') TRUNCATE table [table Name] The following is a description of the usage and principle of the TRUNCATE statement in MSSQLServer2000: Truncate is a statement in SQL that deletes the contents of a datasheet, using the following: Truncate table name is faster and more efficient because: TRUNCATE table is functionally the same as a DELETE statement without a WHERE clause:

SQL Server dynamic Row-column (parameterized table name, grouped column, row-column field, field value) I. Content covered by this article (Contents) What is involved in this article (Contents) Background (contexts) Implementation code (SQL codes) Method One: Use concatenation SQL, static column field; Method Two: Use concatenation

(2 rows affected)*/--method 2create in SQL2005 table TB (IDint, Value varchar (Ten) ) insert into TB values (1,'AA') insert into TB values (1,'BB') insert into TB values (2,'AAA') insert into TB values (2,'BBB') insert into TB values (2,'CCC') GoSelectID, [Values]=stuff (Select ','+[value] fromTB TwhereId=tb.id forXML Path ("')),1,1,"') fromTbgroup by ID/*ID values-------------------------------1 aa,bb2 aaa,bbb,ccc (2 row (s) affected)*/The drop table TB split value has a table TB, as follows:

Label:In writing SQL, we often encounter such a problem. Every time you insert, you have to judge whether the data table already exists in this data, the so-called same data, except the primary key all columns are the same, no insert, there is update. In this situation, we do not know whether this column exists, so the simple insertion and update are problematic, so some people choose to delete the correspo

Tags: sub share picture color src info. com div from bodyOriginal dataYou want to split the two columns into:SQL statements and ideasIdea: Split column A and column B separately, with line numbers equal as conditional connectionsSelectManagerid,manager from(SELECT row_number () over (ORDER by B.number) asOrderid,substring (Prjmanager,b.number,charindex (',', prjmanager+',', B.number)-B.number) as Manager from [dbo]. [Cm_contract] T1 INNER join master.

In this article, this clause is briefly described, and some code instances are provided, which is the best way to illustrate the use of having clauses. Strictly speaking, having does not require a child table, but having no child table has no practical significance. If you only need a table, then you can use the WHERE clause to achieve all of your goals. For practice, having presupposes at least two tables and an aggregate function based on the second table. Here's a simple example: you want a

Strictly speaking, having does not require a child table, but having no child table has no practical significance. If you only need a table, then you can use the WHERE clause to achieve all of your goals. For practice, having presupposes at least two tables and an aggregate function based on the second table. Here's a simple example: you want a customer list with a total order of more than 25000 dollars. You need to properly connect the three tables: Customer, SalesOrderHeader and SalesOrderDet

Tags: SQL Server database list arraySometimes houyouxi may require multiple parameters when queried by the server, and the number of bits is not necessarily dynamic.This could be a condition for passing a list to SQL.----splitalistandreturnatableifids--Usedto takeacommaseparatedlistasastringandreturna table--createfunction[dbo]. [Splitidlist] ( @CommaSeparatedIDList nvarchar (+)) returns @List TABLE ( idi

Tags: SQL query CTS INF Query tab Data Objects Sch instances1. Querying all databases in an instance Select name,database_id from sys.databases 2. Querying all tables in the databaseSelect Table_type,table_name from Information_schema.tables ORDER BY table_name SELECT * from sysobjects where type= ' U ' ORDER by name (all tables)SELECT * from sysobjects where type= ' SQ ' ORDER by nameSELECT * from sysobjects where type= ' FN ' ORDER by nameSELECT * f

In MySQL:[SQL] Viewplaincopyprint?--single-row stitching, first find a row, plus a comma, and then the next line of stitching isolatedSelectGroup_concat (E.support) fromENGINES EwhereE.xainch('YES','NO') --The results are as follows: Yes,yes,yes,yes,yes,yes,default,yes --replace the "," in the result of the query with the "* *" numberSelect REPLACE(Group_concat (E.support),',','**') fromENGINES EwhereE.xainch('YES','NO') --The results are as fo

Label:Sql server 1. Determine whether the table users existif object_id(N'Users'N'U') is not NULL Print 'exist' Else Print 'does not exist' 2. Determine if the Name column exists in the table usersif exists(Select * fromsyscolumnswhereId=object_id('Users') andName='Name'collate Chinese_prc_ci_ai_ws)Print 'exist' Else Print 'does not exist'Note: Collate chinese_prc_ci_ai_ws represents case-insensitive Oracle 1. Judging whether the table is a villageDeclare --here is the loc