Oracle & SQL

AND / OR

 SELECT column_name(s)
FROM table_name
WHERE condition
AND|OR condition

ALTER TABLE

 ALTER TABLE table_name
ADD column_name datatype

or

ALTER TABLE table_name
DROP COLUMN column_name

AS (alias)

SELECT column_name AS column_alias
FROM table_name

or

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 TABLE

CREATE TABLE table_name
(
column_name1 data_type,
column_name2 data_type,
column_name2 data_type,
...
)

CREATE INDEX

CREATE INDEX index_name
ON table_name (column_name)

or

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_value

or

DELETE FROM table_name
(Note: Deletes the entire table!!)

DELETE * FROM table_name
(Note: Deletes the entire table!!)

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

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,....)

or

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_name

or

SELECT 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