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SQL Server Cheat Sheet by

MABD Cheat Sheet
sql

Coloumn Type

Purp­ose
Data Type
Exam­ple
Integers
int(M)
int(5)
Floati­ng-­point (real) numbers
float(M,D)
float(­12,3)
Double­-pr­ecision floati­ng-­point
double­(M,D)
double­(20,3)
Dates and times
timest­amp(M)
timest­amp(8) (for YYYYMMDD)
Fixed-­length strings
char(M)
char(10)
Variab­le-­length strings
varchar(M)
varcha­r(20)
A large amount of text
blob
blob
Values chosen from a list
enum('­val­ue1­',v­alu­e2'­,...)
enum('­app­les­','­ora­nge­s',­'ba­nanas')

Mathem­atical Functions

What
How
Count rows per group
COUNT(­column | *)
Average value of group
AVG(co­lumn)
Minumum value of group
MIN(co­lumn)
Maximum value of group
MAX(co­lumn)
Sum values in a group
SUM(co­lumn)
Absolute value
abs(nu­mber)
Rounding numbers
round(­number)
Largest integer not greater
floor(­number)
Smallest integer not smaller
ceilin­g(n­umber)
Square root
sqrt(n­umber)
nth power
pow(ba­se,­exp­onent)
random number n, 0<n < 1
rand()
sin (similar cos, etc.)
sin(nu­mber)

String Functions

What
How
Compare strings
strcmp­(st­rin­g1,­str­ing2)
Convert to lower case
lower(­string)
Convert to upper case
upper(­string)
Left-trim whitespace (similar right)
ltrim(­string)
Substring of string
substr­ing­(st­rin­g,i­nde­x1,­index2)
Encrypt password
passwo­rd(­string)
Encode string
encode­(st­rin­g,key)
Decode string
decode­(st­rin­g,key)
Get date
curdate()
Get time
curtime()
Extract day name from date string
daynam­e(s­tring)
Extract day number from date string
dayofw­eek­(st­ring)
Extract month from date string
monthn­ame­(st­ring)
 

Date Functions

DATEADD (datepart, number , date)
DATEDIFF (datepart , start , end)
DATENAME (datepart, date)
DATEPART (datepart, date)
DAY (date)
GETDATE()
GETUTC­DATE()
MONTH(­date)
YEAR(date)

Date Parts

Year
yy, yyyy
Quarter
qq, q
Day
dd, d
Day of Year
dy, y
Month
mm, m
Week
wk, ww
Hour
hh
Minute
mi, n
Second
ss, s
Milisecond
ms

Type Conversion

CAST (expre­ssions AS datatype)
CONVERT (datatype , expres­sion)

Ranking Functions

RANK
NTILE
DENSE_RANK
ROW_NUMBER

Gruoping Functions

AVG
MAX
BINARY­_CH­ECKSUM
MIN
CHECKSUM
SUM
CHECKS­UM_AVG
STDEV
COUNT
STDEVP
COUNT_BIG
VAR
GROUPING
VARP

Table Functios

ALTER
DROP
CREATE
TRUNCATE

Create a Trigger

CREATE TRIGGER name
ON
table
FOR
DELETE, INSERT, UPDATE
AS
-- Comments
SELECT * FROM table
GO

Create a View

CREATE VIEW name
AS
-- Comments
SELECT FROM table*
GO
 

Create Table

CREATE TABLE table (
column1 type [[NOT] NULL]
[AUTO_­INC­REM­ENT],
column2 type [[NOT] NULL]
[AUTO_­INC­REM­ENT],
...
other options,
PRIMARY KEY (colu­mn(s)) );

Insert Data

INSERT INTO table VALUES
(list of values);
INSERT INTO table SET
colum­n1=­val­ue1,
colum­n2=­val­ue2,
...
column­k=v­aluek;
INSERT INTO table (colum­n1,­col­umn­2,...)
VALUES (valu­e1,­val­ue2­...);

Insert­/Select

INSERT INTO *table (colum­n1,­col­umn­2,...)
SELECT statem­ent;*
(See below)

Delete data

DELETE FROM table
[WHERE condi­tio­n(s)];



(Omit WHERE to delete all data)

Updating Data

UPDATE table SET
colum­n1=­val­ue1,
colum­n2=­val­ue2,
...
colum­nk=­valuek
[WHERE condi­tio­n(s)];

Insert column

ALTER TABLE table ADD COLUMN
column type options;

Delete Column

ALTER TABLE table
DROP COLUMN column;

Delete table (Care­ful!)

DROP TABLE [IF EXISTS] table;

Create an Index

CREATE UNIQUE INDEX name
ON
table (columns)

Create a Stored Procedure

CREATE PROCEDURE name
@variable AS datatype = value
AS
-- Comments
SELECT FROM table*
GO

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