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SQL

QuestionAnswer
SELECT and WHERE SELECT <colName1>, <colName2> FROM <table name> WHERE <colNam3> = <param>
AND/OR SELECT * FROM Persons WHERE LastName='Svendson' AND (FirstName='Tove' OR FirstName='Ola')
ORDER BY SELECT * FROM Persons ORDER BY LastName DESC
INSERT INTO _____ VALUES INSERT INTO Persons VALUES (4,'Nilsen', 'Johan', 'Bakken 2', 'Stavanger') INSERT INTO Persons (P_Id, LastName, FirstName) VALUES (5, 'Tjessem', 'Jakob')
UPDATE _______ SET UPDATE Persons SET Address='Nissestien 67', City='Sandnes' WHERE LastName='Tjessem' AND FirstName='Jakob'
DELETE DELETE FROM table_name WHERE some_column=some_value
TOP SELECT TOP 2 * FROM Persons SELECT TOP 50 PERCENT * FROM Persons ORACLE equiv: SELECT * FROM Persons WHERE ROWNUM <=5
LIKE SELECT * FROM Persons WHERE City LIKE '%tav%' SELECT * FROM Persons WHERE City NOT LIKE '%tav%'
% A substitute for zero or more characters
_ A substitute for exactly one character
[^charlist] or [!charlist] Any single character not in charlist
IN SELECT * FROM Persons WHERE LastName IN ('Hansen','Pettersen')
BETWEEN SELECT column_name(s) FROM table_name WHERE column_name BETWEEN value1 AND value2 SELECT column_name(s) FROM table_name WHERE column_name NOT BETWEEN value1 AND value2
ALIAS For tables: SELECT po.OrderID, p.LastName, p.FirstName FROM Persons AS p, Product_Orders AS po WHERE p.LastName='Hansen' AND p.FirstName='Ola' for columns: SELECT column_name AS alias_name FROM table_name
JOIN or INNER JOIN SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo FROM Persons INNER JOIN Orders ON Persons.P_Id=Orders.P_Id ORDER BY Persons.LastName
LEFT JOIN SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo FROM Persons LEFT JOIN Orders ON Persons.P_Id=Orders.P_Id ORDER BY Persons.LastName
RIGHT JOIN SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo FROM Persons RIGHT JOIN Orders ON Persons.P_Id=Orders.P_Id ORDER BY Persons.LastName
FULL JOIN SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo FROM Persons FULL JOIN Orders ON Persons.P_Id=Orders.P_Id ORDER BY Persons.LastName
UNION (only selects distinct values) 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
INTO SELECT column_name(s) INTO new_table_name [IN externaldatabase] FROM old_tablename SELECT * INTO Persons_Backup IN 'Backup.mdb' FROM Persons
CREATE DATABASE CREATE DATABASE database_name
CREATE TABLE CREATE TABLE Persons ( P_Id int, LastName varchar(255), FirstName varchar(255), Address varchar(255), City varchar(255) )
NOT NULL -- can't update or add new records w/o having value for notnull constrained col, col has to have value CREATE TABLE Persons ( P_Id int NOT NULL, LastName varchar(255) NOT NULL, FirstName varchar(255), Address varchar(255), City varchar(255) )
UNIQUE CREATE TABLE Persons ( P_Id int NOT NULL UNIQUE, LastName varchar(255) NOT NULL, FirstName varchar(255), Address varchar(255), City varchar(255) )
UNIQUE (multiple columns) CREATE TABLE Persons ( P_Id int NOT NULL, LastName varchar(255) NOT NULL, FirstName varchar(255), Address varchar(255), City varchar(255), CONSTRAINT uc_PersonID UNIQUE (P_Id,LastName) )
UNIQUE (to add after table already created [alter] table) ALTER TABLE Persons ADD UNIQUE (P_Id) for multiple columns: ALTER TABLE Persons ADD CONSTRAINT uc_PersonID UNIQUE (P_Id,LastName)
UNIQUE (to remove constraint) ALTER TABLE Persons DROP CONSTRAINT uc_PersonID
PRIMARY KEY CREATE TABLE Persons ( P_Id int NOT NULL PRIMARY KEY, LastName varchar(255) NOT NULL, FirstName varchar(255), Address varchar(255), City varchar(255) )
PRIMARY KEY (multiple columns) CREATE TABLE Persons ( P_Id int NOT NULL, LastName varchar(255) NOT NULL, FirstName varchar(255), Address varchar(255), City varchar(255), CONSTRAINT pk_PersonID PRIMARY KEY (P_Id,LastName) )
(To add key after table already created): PRIMARY KEY ALTER TABLE Persons ADD PRIMARY KEY (P_Id) ALTER TABLE Persons ADD CONSTRAINT pk_PersonID PRIMARY KEY (P_Id,LastName)
(To remove constraint): PRIMARY KEY ALTER TABLE Persons DROP CONSTRAINT pk_PersonID
Created by: sjampana920
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