SQL其次是独特的一套所谓的语法规则和准则。本教程为您提供了一个快速入门使用SQL列出所有的基本SQL语法:
所有SQL语句开始以类似关键字 SELECT, INSERT, UPDATE, DELETE, ALTER, DROP, CREATE, USE, SHOW 并且所有的语句用分号(;)结束。
重要的一点要注意的是,MySQL是不区分大小写的,这意味着SELECT和select在SQL语句中具有相同的含义,但MySQL在表名有差异。如果使用MySQL的话,那么需要存在于数据库中给定的表名。
所有在本教程中所举的例子已经过在MySQL服务器测试并使用。
SELECT column1, column2....columnN FROM table_name;
SELECT DISTINCT column1, column2....columnN FROM table_name;
SELECT column1, column2....columnN FROM table_name WHERE CONDITION;
SELECT column1, column2....columnN FROM table_name WHERE CONDITION-1 {AND|OR} CONDITION-2;
SELECT column1, column2....columnN FROM table_name WHERE column_name IN (val-1, val-2,...val-N);
SELECT column1, column2....columnN FROM table_name WHERE column_name BETWEEN val-1 AND val-2;
SELECT column1, column2....columnN FROM table_name WHERE column_name LIKE { PATTERN };
SELECT column1, column2....columnN FROM table_name WHERE CONDITION ORDER BY column_name {ASC|DESC};
SELECT SUM(column_name)FROM table_name WHERE CONDITION GROUP BY column_name;
SELECT COUNT(column_name)FROM table_name WHERE CONDITION;
SELECT SUM(column_name)FROM table_name WHERE CONDITION GROUP BY column_name HAVING (arithematic function condition);
CREATE TABLE table_name(column1 datatype,column2 datatype,column3 datatype,.....columnN datatype,PRIMARY KEY( one or more columns ));
DROP TABLE table_name;
CREATE UNIQUE INDEX index_name ON table_name ( column1, column2,...columnN);
ALTER TABLE table_name DROP INDEX index_name;
DESC table_name;
TRUNCATE TABLE table_name;
ALTER TABLE table_name {ADD|DROP|MODIFY} column_name {data_ype};
ALTER TABLE table_name RENAME TO new_table_name;
INSERT INTO table_name( column1, column2....columnN)VALUES ( value1, value2....valueN);
UPDATE table_name SET column1 = value1, column2 = value2....columnN=valueN[ WHERE CONDITION ];
DELETE FROM table_name WHERE {CONDITION};
CREATE DATABASE database_name;
DROP DATABASE database_name;
USE database_name;
COMMIT;
ROLLBACK;
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原文地址:http://yongguang.blog.51cto.com/9153118/1686285