MySQL

We can use the mysql command mode to import or export csv files. If you need it, you can simply refer to it. Mysql> select * from tt_address;+ ----- + -------- + ------ + -------- + ------------ + ------------- + ----------- + ---------- + ------- +

How to change the storage path of the mysql tutorial database tutorial Open your mysql installation directory and find the my. ini file (my file is downloaded from studymysql in c: program filesphp tutorial) Search for datadir or # path to the

Create index Create [unique | fulltext | spatial] index index_name [using index_type] on tbl_name (index_col_name,...) index_col_name: col_name [(length)] [asc | desc] Drop index Drop index name Now let's take a look at a simple example of

The code to randomly generate a string is as follows: Define a random string method in the mysql tutorial, and then call this method in the SQL statement. Method for defining random string functions:Select round (rand (), 4) * 10000 );You can simply

CaseCalculate the condition list and return one of multiple possible result expressions. Case has two formats: The simple case function compares an expression with a group of simple expressions to determine the result. The case search function

In linux, run the following command to start the mysql Tutorial:Mysqladmin start/Ect/init. d/mysql start (the installation path of mysql is earlier)   2. Command for restarting mysql in linux:Mysqladmin restart/Ect/init. d/mysql restart (the

In the mysql tutorial, there is a string connection function concat (). Let's talk about how to use it. Concat syntax Concat (str1, str2 ,...) Look at the code in the dedecms search program.   $ K = addslashes ($ k ); If ($ this->

Mysql tutorial how to export a database tutorial This article has added to my favorites most of the methods for exporting databases from mysql. A friend sent an email yesterday asking me how to export the database from mysql. Below we have

MySql stored procedure creation and deletion and instance The stored procedure in the mysql tutorial is a stored procedure with parameters (dynamic execution of SQL statements). The Stored Procedure in mysql queries user information based on user

The Simple Method for deleting a record in mysql is the simplest entry level. Let's take a look at how to delete a record using mysql SQL statements. The Simple Method for deleting a record in the mysql tutorial is the simplest entry level. Let's

Solution to the slow sqlite3 speed The speed of sqlite3 insert into and other operations is relatively slow. The reason is that the file already exists in the disk, and the file must be opened every time you access it, If you perform a lot of

Correct Solution for forgetting the root password in the mysql tutorial This article describes the correct solution for mysql to forget the root password. We all know that the password is missing during actual operations. This is a headache. The

Three methods to solve MYSQL Chinese garbled characters Method 3 1> in this article, garbled characters are eliminated in three steps: > Eliminate page garbled characters, > Remove Chinese garbled characters from the mysql tutorial, > Eliminates

Select * from table limit 0, 10 // If the input page number is greater than the total page number, the error message is displayed. If ($ page> $ pagenum | $ page = 0 ){Echo "error: can not found the page .";Exit;} $ Offset = ($ page-1) * $ num; //

Mysql tutorial log cleanup and mysql Log Analysis SET NOCOUNT ONDECLARE @ LogicalFileName sysname,@ MaxMinutes INT,@ NewSize INTUSE tablename-name of the database tutorial to be operatedSelect @ LogicalFileName = 'tablename _ log',-log File Name@

Remove duplicate records from multi-table queries First, we can think of using group by or distinct to remove duplicate records in SQL multi-table queries, and then think of inner left, etc,Let's take a look at an instance. View a distinct

DELETE statement The DELETE statement is used to DELETE rows in a table.Syntax Delete from table name WHERE column name = ValuePerson: LastName FirstName Address City Gates Bill Xuanwumen 10 Beijing

This chapter describes the select distinct statements.SQL SELECT DISTINCT statement Duplicate values may exist in the table. This is not a problem. However, sometimes you may want to list only different values. The keyword DISTINCT is used to return

The SQL having clause is used to limit the output of a conditional SQL statement. It is used by an SQL statement in the SELECT list of your columns. You cannot specify an SQL standard for which SQL Aggregate functions are used for column terms in

Mysql tutorial custom primary key step size MethodCreate table if not exists 'useradmin '('Id' int (4) not null auto_increment,'Username' varchar (20) default NULL,'Userpass' varchar (40) default NULL,'Logins' int (4) not null default '0' comment'