SQL 语句 |
语法 |
AND / OR |
SELECT column_name(s)
FROM table_name
WHERE condition
AND|OR condition |
ALTER TABLE |
ALTER TABLE table_name
ADD column_name datatypeorALTER TABLE table_name
DROP COLUMN column_name |
AS (别名) |
SELECT column_name AS column_alias
FROM table_nameorSELECT 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 TABLE |
CREATE TABLE table_name
(
column_name1 data_type,
column_name2 data_type,
column_name3 data_type,
...
) |
CREATE INDEX |
CREATE INDEX index_name
ON table_name (column_name)
或者
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 |
DELETE FROM table_name
WHERE some_column=some_valueor
DELETE FROM table_name
(Note: 删除整个表!!)DELETE * FROM table_name
(Note: 删除整个表!!) |
DROP DATABASE |
DROP DATABASE database_name |
DROP INDEX |
DROP INDEX table_name.index_name (SQL Server)
DROP INDEX index_name ON table_name (MS Access)
DROP INDEX index_name (DB2/Oracle)
ALTER TABLE table_name
DROP INDEX index_name (MySQL) |
DROP TABLE |
DROP TABLE table_name |
EXISTS |
IF EXISTS (SELECT * FROM table_name WHERE id = ?)
BEGIN
--如果存在时执行
END
ELSE
BEGIN
--不存在时执行
END |
GROUP BY |
SELECT column_name, aggregate_function(column_name)
FROM table_name
WHERE column_name operator value
GROUP BY column_name |
HAVING |
SELECT column_name, aggregate_function(column_name)
FROM table_name
WHERE column_name operator value
GROUP BY column_name
HAVING aggregate_function(column_name) operator value |
IN |
SELECT column_name(s)
FROM table_name
WHERE column_name
IN (value1,value2,..) |
INSERT INTO |
INSERT INTO table_name
VALUES (value1, value2, value3,....)
或者
INSERT INTO table_name
(column1, column2, column3,...)
VALUES (value1, value2, value3,....) |
INNER JOIN |
SELECT column_name(s)
FROM table_name1
INNER JOIN table_name2
ON table_name1.column_name=table_name2.column_name |
LEFT JOIN |
SELECT column_name(s)
FROM table_name1
LEFT JOIN table_name2
ON table_name1.column_name=table_name2.column_name |
RIGHT JOIN |
SELECT column_name(s)
FROM table_name1
RIGHT JOIN table_name2
ON table_name1.column_name=table_name2.column_name |
FULL JOIN |
SELECT column_name(s)
FROM table_name1
FULL JOIN table_name2
ON table_name1.column_name=table_name2.column_name |
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 |
SELECT *
INTO new_table_name [IN externaldatabase]
FROM old_table_nameorSELECT column_name(s)
INTO new_table_name [IN externaldatabase]
FROM old_table_name |
SELECT TOP |
SELECT TOP number|percent column_name(s)
FROM table_name |
TRUNCATE TABLE |
TRUNCATE TABLE table_name |
UNION |
SELECT column_name(s) FROM table_name1
UNION
SELECT column_name(s) FROM table_name2 |
UNION ALL |
SELECT column_name(s) FROM table_name1
UNION ALL
SELECT column_name(s) FROM table_name2 |
UPDATE |
UPDATE table_name
SET column1=value, column2=value,...
WHERE some_column=some_value |
WHERE |
SELECT column_name(s)
FROM table_name
WHERE column_name operator value |