mysql math operators

In fact, in the database most often used as a query operationBasic syntaxSELECT [All | DISTINCT | Distinctrow] field list as field alias [from table name WHERE conditional expression GROUP by field name | expression [ASC | DESC],

Guide to MySQL upgrade Http://blog.sina.com.cn/s/blog_5a8b8eb80100ld7a.html We recommend that you upgrade the version from one released version to another. For example, to upgrade MySQL 3.23 to MySQL 4.0, instead of directly upgrading to MySQL 4.1

==============================SQL Memo CRUD queries multi-table events, etc.===============================--------------------------------------------------------------------------------------------------A. Database   1. Creating database   Create

1. Introduction to the Database 1.1What is a database, a file system that operates on a database using standard SQL 1.2a common databaseOracle is a database of Oracle companies, a large database for a feeDB2, IBM's database, is a large database of

Mysql common functions, difficulties, notes, and difficulties of mysql Functions I. mathematical functionsABS (x) returns the absolute value of x.BIN (x) returns the binary value of x (OCT returns octal, HEX returns hexadecimal) CEILING (x) returns

MySQL advanced queryAdvanced QueryKeyword Write order keyword execution orderSelect: Projection Results 1 5From: Navigate to Table 2 1Where: First filter before grouping 3 2GROUP BY: Group 4 3Having: Second filter after grouping 5 4ORDER BY: Sort 6 6

MySQL multi-Table query, MySQLI. Use the SELECT clause for multi-table queries SELECT field name FROM table 1, Table 2... WHERE table 1. Field = TABLE 2. Field AND other query ConditionsSELECT. id,. name,. address,. date, B. math, B. english, B.

MySQL database operations on tablesTable records of additions and deletions to change1. Add a tableYou must have a table structure before inserting a record!CREATE TABLE Score ( ID int PRIMARY KEY auto_increment, Name VARCHAR (20), Chinese FLOAT (

1, MySQL system time automatic acquisition:      column type           display format    TIMESTAMP (+)   yyyymmddhhmmss   TIMESTAMP (  yymmddhhmmss  ); TIMESTAMP (Ten)   yymmddhhmm   TIMESTAMP (8)    yyyymmdd   TIMESTAMP (6)    yymmdd  

1, the use of the deposit process, a lot of similarity to delete, update, new and other operations became easy, and later also easy to manage! 2, stored procedures because the SQL statement has been pre-programmed Yi, so the speed of the run is