affected rows

Note: unless the table has a primary key or UNIQUE index, using a REPLACE statement is meaningless. This statement is the same as INSERT, because no index is used to determine whether other rows have been copied in the new row.[Separator]The values

We often use the MySQL replace function. The following describes the usage of the MySQL replace function in detail, hoping to enlighten you in learning the MySQL replace function.I recently studied CMS and used mysql replace function during data

In mysql, the left join, right join, and inner join queries are commonly used. But some friends know the differences between them, next I will introduce you to you. LEFT JOIN Two tables in the join relationship are displayed. After the data table on

It takes 8 minutes for mysql to create and delete indexes... current Environment: -------------- table row: 30W version 5.0.45-community-nt System XP CPU2.11G MEM2G test statement :---------------------- Create index I _atian ON gaopinzi (atian)

1. Theory As long as the public fields of the two tables have matched values, the records in the two tables are combined. My personal understanding: Use a common field to calculate the intersection of the two tables that meet the requirements, and

Take the users table as an example. There are three fields: Self-incrementing id, int type, name, nvarchar type, password pwd, and nvarchar type. System is first introduced in vs2005. data. oracleClient; namespace publicintInsert (stringname,

The ExecuteNonQuery () method is used to Update data. Generally, it uses the Update, Insert, and Delete statements. The returned values of the statements mean: For Update, Insert, if the Delete statement is successfully executed, the returned value

REPLACE runs like INSERT. Except for one, if an old record in the table has the same value as a new record used for the primary key or a UNIQUE index, the old record is deleted before the new record is inserted.MySQL Replace INTO descriptionREPLACE

Package Com.examp.use_sqlite.dao;import Java.util.arraylist;import Java.util.list;import Android.content.contentvalues;import Android.content.context;import Android.database.cursor;import Android.database.sqlite.sqlitedatabase;import

Talking about mysql user-defined functions and mysql Functions To customize the number of mysql rows DELIMITER $ drop function if exists 'onlinefunction '$ create function 'onlinefunction' (rrrr VARCHAR (50) returns varchar (255) BEGINIF (rrrr =

SQL Syntax: innerjoinon, leftjoinon, and rightjoinon. SQL Syntax: inner join on, left join on, right join on detailed usage method. 1. Theory As long as the public fields of the two tables have matched values, the records in the two tables are

-- The simple stored procedure is as follows:Bytes ----------------------------------------------------------------------------------------Create proc p_test@ Name varchar (20 ),@ Rowcount int outputAsBeginSelect * From t_customer whereName = @

  Left join returns records that include all records in the left table and join fields in the right table.Right join returns records that include all records in the right table and the joined fields in the left table.Inner join (equivalent join)

  /* Everyone knows that it will be very tiring to write a blog. Hope = reprint please indicate the source: http://blog.csdn.net/ta893115871 Please do not pity your mouse, (* ^__ ^ *) Xi ...... */ As we all know, databases are very important.

Technorati labels:. net, ADO. net, Oracle, dbhelperora We know. net in the Process of calling oracle is not so convenient to call the stored procedures in the MS-SQLSERVER, especially when the parameter output is used, but the powerful Oracle

Normal row-column conversion (version 1.0) only provides static and dynamic writing for SQL Server 2000, and Version 2.0 adds SQL Server 2005 writing. Question: Suppose there is a student orders table (TB) as follows: Name course score Zhang

(Method 1) how to call ASP. NETMySQLStored Procedures Because the project needs to call the MySQL stored procedure in ASP. NET,Baidu and Google found that the explanation of Chinese websites is not very clear.No way. You only need to do it

In SQL Server, there are not many opportunities to extend the storage process for direct use.I have summarized several useful extended stored procedures as follows: -- Obtain the version number of MS SQLExecute master .. sp_msgetversionGo-- The

Normal row-column conversion (version 1.0) only provides static and dynamic writing for SQL Server 2000, and Version 2.0 adds SQL Server 2005 writing. Question: Suppose there is a student orders table (TB) as follows: Name course score Zhang

Replace runs like insert. There is only one exception. Assume that an old record in the table and a record used for primary If the new record of a key or unique index has the same value, the old record is deleted before the new record is