sql where multiple conditions

Share the following method of deleting duplicate records in a database with an SQL statement.For example, there is now a person table (table name: peosons)If you want to name, ID, address, the three fields exactly the same record querySelect p1.* from Persons p1,persons P2 where p1.idCan achieve the above effect.Several SQL statements that delete duplicate records 1. Using the rowID method2. Using the group

Label: $sql = ' INSERT into ' table1 ' (' CustomerID ', ' AdvertisementID ', ' consumedstatus ', ' Consumedtime ') VALUES (: CustomerID,: Advertisementid,:consumedstatus,:consumedtime); UPDATE ' table2 ' SET ' consumedtimes ' = ' consumedtimes ' + 1 WHERE ' advertisementid ' =: AdvertisementID; UPDATE ' table3 ' SET ' appadpoint ' = ' appadpoint ' +:p rice WHERE ' customerID ' =: CustomerID ';

Label:The SQL statement in the company's code may be called by multiple methods, but some methods will be associated with other tables, so if the modification is inappropriate, the same method of invoking the SQL statement will cause an error.Recently done a function of the company, there is such a problem, although this feature is completed, but the other method

SQL Server adds the syntax of multiple fields to the table. SQL Server Fields Add field syntax Alter table table_name add column_name + field type + Constraints Add multiple fields to a table: Use nature1_oalter table XunHu add MaleCount varchar (50) null, FemaleCount varchar (50) null, SubadultCount varchar (50) n

option (Force order), pay attention to the wording itself is not the small table at the front,In complex cases, although the problem is caused by the sequence of drivers, the option force order does not necessarily make sense, because when a multi-table connection is made, it is not necessarily a reasonable driving order to drive in a written manner.Even more serious problems arise, refer to: http://www.cnblogs.com/wy123/p/6238844.html, so it is not recommended to mess with option (Force order)

One-to-Multiple SQL statement syntax for fields between SQL SERVER tables and tables, serversql Table A1 A2 A3 A4 01 02 03 04 03 04 01 02 Table B B1 B2 01 Zhang San 02 Li Si 03 Wang Wu 04 Zhao Liu

SQL SQL statement for inserting multiple dataThere are three ways to do this:1.InSert into Select From Example: INSERT into Tongxunlu (name, phone, email)SELECT Sname,saddress,semailFrom Students This method requires a new table to be built first.2.Select (column name)into From Example: SELECT students.sname,students.saddress,students.semailInto TongxunluFrom Stu

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 SQL Server statements are as follows:Select substring ((SE

In our project development, we often encounter the requirements of multiple conditional fuzzy queries. There are two common solutions for this: one is to stitch the SQL string at the end of the program, construct the corresponding SQL string based on whether a condition is selected, and use the dynamic SQL statement in

number according to the correlation condition According to the SELECT * from Item WHERE owner_id in (...) and category_id=1//both use the on condition during the query. $users= User::find ()->joinwith (' books ')all (); Copy code if the join operation is not used, either with or directly with the property to access the association. This time the on condition is used as the Where condition. //SELECT * from user WHERE id=10 $user= User::findone (10); Copy Code summary First you need to define t

However, Microsoft SQL Server has an important flaw in processing such indexes, which is to index the operations that should be compiled into the index seek, which can cause severe performance degradation Let me give you an example to illustrate the problem. Assuming that a table T has an index (Cityid, Sentdate, UserID), and now has a paging list feature, to obtain a query that is larger than a number of records in a

This article describes how to use PHP + Mysql to generate SQL statements with multiple keywords and fields. it involves string and array operations and is a very practical technique for constructing SQL statements, for more information about how to use PHP + Mysql to generate SQL statements using

Spelling tips for multiple query criteria for SQL statements. Spelling tips for multiple query criteria for SQL statements. $sql = "SELECT * from TB1";if ($id =$_get[' id '){$where. = "where id like"% $id% "";}if ($name =$_get[' name '){$where. = "where name like"% $name%

specified in the left outer clause, not just the rows matched by the join column. If a row in the left table does not match a row in the right table, all the selection list columns in the right table in the row of the associated result set are null ).(2) SQL statementsSelect * From Table1 left join Table2 on table1.id = table2.id------------- Result -------------ID name ID score------------------------------1 Lee 1 902 Zhang 2 1004 Wang null ////////

1. cause: The default SQL connection port is 1433. When the port is occupied after the earlier version is installed, another port number is automatically specified when the later version is used, in this case, the client cannot connect to the correct database instance by using the default port number. 2. solution: If a physical server has multiple SQL Serve

(8000) Select @sql =isnull (@sql + ' union All ', ') + ' select name, [Course]= ' +quotename (name, ' "') + ', [score] = ' +quotename (name) + ' fro M TB ' from syscolumns WHERE name!= ' name ' and id=object_id (' TB ')--table name TB, not including other columns named name ORDER by Colid exec ( @sql + ' ORDER by name ') go 3. Using

finally found on Wikipedia as an argument.SQL defines two different syntax ways to represent "connections." The first is the explicit join symbol, which uses the keyword explicitly, followed by JOIN the implicit join symbol, which uses the so-called implicit join symbol. The implicit join symbol places the tables that need to be connected into the parts of the SELECT statement FROM , separated by commas. This makes up a "cross-join" where the WHERE statement may place some filter predicates (fi

Function for generating SQL statements using multiple keywords and fields in PHP $ Keyword = "1 2 3 "; Echo $ SQL = search ($ keyword, "enter_gongyin_pic", "a + B + c"); // function generation, no LIMIT, no ORDER Generate an SQL statement: SELECT * FROM 'Enter

A recent software upgrade involves changes to the database table fields (new or deleted or modified), All SQL statements about the changes to the database are stored in the Sqlupdate.sql file, and all SQL statements in the Sqlupdate.sql are executed every time the upgrade, which involves the issue of executing multiple statements. Software developed on the CodeIg

This article describes how to use PHP + Mysql to generate SQL statements with multiple keywords and fields. it involves string and array operations and is a very practical technique for constructing SQL statements, for more information about how to use PHP + Mysql to generate SQL statements using