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SQL 学习总结

2010-08-16 18:25 363 查看
语句
语法
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
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