SQL快速参考

SQL 语句

语句	语法
AND / OR	SELECT column_name(s)FROM table_nameWHERE conditionAND|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_aliasFROM table_name
AS (alias for table)	SELECT column_nameFROM table_name  AS table_alias
BETWEEN	SELECT column_name(s)FROM table_nameWHERE column_nameBETWEEN value1 AND value2
CREATE DATABASE	CREATE DATABASE database_name
CREATE INDEX	CREATE INDEX index_nameON 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_nameON table_name (column_name)
CREATE VIEW	CREATE VIEW view_name ASSELECT column_name(s)FROM table_nameWHERE condition
DELETE FROM	DELETE FROM table_name (**Note: **Deletes the entire table!!)*or*DELETE FROM table_nameWHERE 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_nameGROUP BY column_name1
HAVING	SELECT column_name1,SUM(column_name2)FROM table_nameGROUP BY column_name1HAVING SUM(column_name2) condition value
IN	SELECT column_name(s)FROM table_nameWHERE column_nameIN (value1,value2,..)
INSERT INTO	INSERT INTO table_nameVALUES (value1, value2,….)*or*INSERT INTO table_name(column_name1, column_name2,…)VALUES (value1, value2,….)
LIKE	SELECT column_name(s)FROM table_nameWHERE column_nameLIKE pattern
ORDER BY	SELECT column_name(s)FROM table_nameORDER 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_nameFROM original_table_name*or*SELECT column_name(s)INTO new_table_nameFROM original_table_name
TRUNCATE TABLE(deletes only the data inside the table)	TRUNCATE TABLE table_name
UPDATE	UPDATE table_nameSET column_name=new_value[, column_name=new_value]WHERE column_name=some_value
WHERE	SELECT column_name(s)FROM table_nameWHERE condition