SQL 快速参考

2019年6月9日 225次阅读 来源: 筱南独舞

常用的SQL 语句记录一下：

  • AND / OR：SELECT column_name(s) FROM table_name WHERE condition AND|OR condition
  • ALTER TABLE (add column)：ALTER TABLE table_name ADD column_name datatype
  • ALTER TABLE (drop column)：ALTER TABLE table_name DROP COLUMN column_name
  • AS (alias for column)：SELECT column_name AS column_alias FROM table_name
  • AS (alias for table)：SELECT column_name FROM table_name AS table_alias
  • BETWEEN：SELECT column_name(s) FROM table_name WHERE column_name BETWEEN value1 AND value2
  • CREATE DATABASE：CREATE DATABASE database_name
  • CREATE INDEX：CREATE INDEX index_name ON table_name (column_name)
    +CREATE TABLE：CREATE TABLE table_name (column_name1 data_type,
    column_name2 data_type,…….)
  • CREATE UNIQUE INDEX：CREATE UNIQUE INDEX index_name ON table_name (column_name)
  • CREATE VIEW：CREATE VIEW view_name AS SELECT column_name(s) FROM table_name WHERE condition
  • DELETE FROM：DELETE FROM table_name (Note: Deletes the entire table!!) or DELETE FROM table_name WHERE condition
  • DROP DATABASE：DROP DATABASE database_name
  • DROP INDEX：DROP INDEX table_name.index_name
  • DROP TABLE：DROP TABLE table_name
  • GROUP BY：SELECT column_name1,SUM(column_name2) FROM table_name GROUP BY column_name1
  • HAVING：SELECT column_name1,SUM(column_name2) FROM table_name GROUP BY column_name1 HAVING SUM(column_name2) condition value
  • IN：SELECT column_name(s) FROM table_name WHERE column_name IN (value1,value2,..) INSERT INTO INSERT INTO table_name VALUES (value1, value2,….) or INSERT INTO table_name (column_name1, column_name2,…) VALUES (value1, value2,….)
  • LIKE：SELECT column_name(s) FROM table_name WHERE column_name LIKE pattern
  • ORDER BY：SELECT column_name(s) FROM table_name ORDER BY column_name [ASC|DESC]
  • SELECT：SELECT column_name(s) FROM table_name
  • SELECT *：SELECT * FROM table_name
  • SELECT DISTINCT：SELECT DISTINCT column_name(s) FROM table_name
  • SELECT INTO：(used to create backup copies of tables) SELECT * INTO new_table_name FROM original_table_name or SELECT column_name(s) INTO new_table_name FROM original_table_name
  • TRUNCATE TABLE：(deletes only the data inside the table) TRUNCATE TABLE table_name
  • UPDATE：UPDATE table_name SET column_name=new_value [, column_name=new_value] WHERE column_name=some_value
  • WHERE：SELECT column_name(s) FROM table_name WHERE condition
    —- 摘自 W3School —-
    原文作者：筱南独舞
    原文地址: https://www.jianshu.com/p/1a5e92b42a9b
    本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
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