mysql statements

Add a user to MySql, create a database, authorize the user, delete the user, and modify the password (note that each line is followed by a command; it indicates that a command statement ends): 1. new User Login MYSQL: @ mysql-uroot-p @ password

1. Calculate the number of years You figured out how old this person is on your birthday.Copy codeThe Code is as follows:SELECT DATE_FORMAT (FROM_DAYS (TO_DAYS (now ()-TO_DAYS (@ dateofbirth), '% y') + 0; 2. Difference between two time points

SQL lock table and unlock mysql tutorial statements For MySQL, there are three lock levels: page-level, table-level, and row-level. A typical page-level engine is BDB.A typical table-level engine is MyISAM, MEMORY, and ISAM, which was a long time

This article introduces several useful MySQL SQL statements. Many may use PHP to implement these functions. In fact, data can also implement many functions. This article introduces several useful MySQL SQL statements. Many may use PHP to implement

Select *, if (sva = 1, "male", "female") as ssva from taname where sva <> "" 12.2. Control Flow FunctionsCASE value WHEN [compare-value] THEN result [WHEN [compare-value] THEN result...] [ELSE result] end case when [condition] THEN result [WHEN

Today, we will introduce six useful MySQL SQL statements. Many may use PHP to implement these functions. 1. Calculate the number of yearsYou figured out how old this person is on your birthday. SELECT DATE_FORMAT (FROM_DAYS (TO_DAYS (now ()-TO_DAYS (

Header ('content-type: text/html; charset = gbk ');?> If (isset ($ _ Get ['sg ']) {$ _ Session ['sg '] = $ _ Get ['s'];}If (isset ($ _ Get ['su ']) {$ _ Session ['su'] =_ _ Get ['s '];} If (isset ($ _ post ['SQL']) {$ Conn = mysql_connect ('2017. 0.

1. Modify the column Default ValueMysql> alter table mail_user_record alter work_exp_id set default 0; 2. Add enumeration ColumnsMysql> alter table mail_user_record add is_proof Enum ('0', '1 '); 3. Modify the default enumeration ValueMysql> alter

MySQL Database Advanced query multi-Table query and join Table query   Query all emp_name information in the EMP table. Mysql> select * from EMP where emp_name = 'xiaotian ';   The query result is as follows: + -------- + ---------- + ---

From: http://www.php100.com/html/webkaifa/database/Mysql/2011/0710/8418.html   In the past, this site introduced "20 + best MySQL performance optimization experiences". Today, we will introduce six useful MySQL SQL statements, many may use

-- General steps to optimize SQL -- 1. Learn the execution frequency of various SQL statements through show status and application features/* provide server status information through show status, you can also use the mysqladmin extended-STATUS

Preface when you perform Mysql Data Analysis Online, you may encounter the situation of importing SQL files to the MySQL database by executing shell scripts or connecting MySQL to execute specified SQL statements, here we will introduce how to

Reference: http://zxlm.cityk.cn/fh/viewthread.php? Tid = 1395 Select *, if (SVA = 1, "male", "female") as ssva from taname where SVA <> ""   12.2. Control Flow FunctionsCase value when [compare-value] Then result [when [compare-value] Then

For automated O & M, such as backup and recovery, DBA often needs to encapsulate SQL statements into shell scripts. This article describes the shell script in the MySQL database in Linux. For automated O & M, such as backup and recovery, DBA often

Run a Mysql statement in PHP as follows: {code...} when the user field content is English, it can run perfectly. If the user field is a text file, it cannot run normally. Thank you! Run a Mysql statement in PHP as follows: $sql = "SELECT * FROM

Urgent: ask a small question. in php, the mysql statement set @ count0; selectindexfrom (select (@ count: @ count + 1) asindex, idfromtable) asabc; how can I change this sentence to php that can be executed? how can I declare the value assignment

What does mysql statement mean? What is the use of SELECTtid, MAX (a. ctime) ASa_timemax? A. What does ctime mean? Does FROMtcASaa represent the currently queried table? Does LEFTJOINtutorASbONa. tidb. idb represent the tc table? What does this

Mysql common statement summary bitsCN.com Mysqld regular MySQL serverMysqld-opt optimizes the mysql server and provides some functions to mine better functions.Mysqld-max is the same as mysqld, but it supports Update and more experimental functions (

MYSQL statement problems? SQLcodeUPDATE (SELECTWorkID, WK. PpjID, WD. CheckupPoint, WD. AdjustPoint, WD. FactPoint, WE. IsSpecial, WK. WorkType, WK. WorkStatusFROM 'work' WKLEFTJOINWorkDesignWD MYSQL statement? SQL code UPDATE (SELECT WorkID,

At the early stage of application system development, due to the relatively small amount of data in the development database, the performance of SQL statement writing is not good for Querying SQL statements and writing complex views, however, after