SQL---常用sql整理

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