SQL - Tamil

8/6/2019 SQL - Tamil

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String / Character / Variable character .

month-date-year date/month/year .

Field .

---> character(50) ---> datetime

.

Babu

4.

valpaiyan @ Arun The Hero

25.

.

. character(50)

Name Field / Column 50


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.

---> character(50)

---> datetime Column ,

Table .

Table Field .

Field .

Field ,

Data Type .

character(50) . 50

. character Data Type .

--> datetime datetime Data Type .


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character, numbers (int,bigint,decimal,float).

datetime DataType

.

Data Type .

SQL Table / / / .

Table Columns . Column DataType

. .

SQL Microsoft SQL Server 2005 Express

Edition .

: 2 SQL

. .

.

.
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.

terms .

. .

.

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dcc397514b41&DisplayLang=en

Database , SQL

.

,

.
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Table, Column, Data Type .

RDBMS ?

RDBMS : Relational Database Management System.

SQL :MS SQL Server, IBM DB2, Oracle, MySQL, and Microsoft Access.

Table ?

Database Table .

Table.

Table ?.

Table Column / Field . Column Table.

Column .

Column Data Type .


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Database Table . Table Database .

Table .( ).

Person#,LastName,FirstName,Address,City Column/Field .

Person# . Data Type numeric.LastName,FirstName,City Data Type

character, variable character .

Address Column , character

variable character .

PinCode column Character . PinCode

,,,
http://4.bp.blogspot.com/_-5Cl9WHU-Uo/SXsqodg1x6I/AAAAAAAADCg/cdJXZrykwlQ/s1600-h/table.jpg


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. numeric character

.

Table Row Tuple ?

Table 3 row .

, 3 row

.

Row Column . Row

.

: 3,Karthik,The Hero,Space, Erode :

. .

3 Karthik : First Name

The Hero : Last Name

Space : Address


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Erode : City

Row Address Space . Column

.

.

Karthik Address .

, Field City Erode .

Column

Allow Null .

A = 0, ----> (numeric)

B = "Karthik" ----> (character)

C = NULL ----> (NULL)

NULL , .

. . NULL - .


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Allow NULL - (true), (false) .

true / false.

,

.

( !).

Karthik 6 .

. Person#.

Primary Key .

Primary Key?

, Primary Key .

Table Row . Row Column .


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Row Row Primary

key .

NULL . ,

NULL .

Primary key NULL ?

. Primary key NULL .

Posted by at 6:58 AM

Identity Column ?

Column , ,

Auto Increment . Column

, Column Identity Column .

Column Data Type numeric .

(Identity Increment), (Identity Seed)
http://tamilsql.blogspot.com/2009/01/sql-2.htmlhttp://tamilsql.blogspot.com/2009/01/sql-2.html


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.

Row, Identity Column

. Row , Identity

Column .

Primary key .

Foreign Key ?

Table . Row . Table

Foreign key .

Table Row ,

Primary key .

Master - Detail .

Master Table Column Primary key . ( Table).


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Primary key Row . Person#.

Primary key

.

Master Table Person# , Detail Table

. .

Data Type . .

Primary - Foreign key Table .

join .

key Column Master-Detail

Table .

Unique ?

Column Row Unique.

Person# Unique Column .


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( : ).

(Person#) Unique .

Primary key Unique . Primary key NULL

. Unique Column , NULL .

.

NULL . / /

. .

Primary key NULL . Unique Column NULL .

DataType ?

SQL Server 2005 Data Types :

user-defined data types (highest)

sql_variant

xml


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datetime

smalldatetime

float

real

decimal

money

smallmoney

bigint

int

smallint

tinyintbit

ntext

text

image

timestampuniqueidentifier

nvarchar

nchar


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varchar

char

varbinary

binary (lowest)

Data Types , Column

., , - Data Type .

Character Variable Character ?

NAME CHARACTER(50) ---> Column , Field name NAME. character DataType

. 50 ( Space)

.

NAME = "Raja" , 4 .

50 . (50)

.


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Raja 4 . 46

. 50

(hard disk) . 46 Space

50 .

variable character , Babu 4

. 46 Space

Space 4 hard

disk . .

UniCode Data Types ?

character, varchar Data Type

.

,

nvarchar, nchar Data Type .


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SQL - 4

Table Structure ?

Column Name, Data Type(Width), Allow Nulls Table

Structure.

Allow Null tick ,

. . .

Allow Null tick , column
http://3.bp.blogspot.com/_-5Cl9WHU-Uo/SX1CUbm2NpI/AAAAAAAADCs/BGnI-VefvHE/s1600-h/tablestructure.png


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.

. Identity Column .

Column AddressID .

Table primary key .

Primary key Row .

AddressID Identity Column ,

. Database

AddressID Input .

Table Structure AddressLine2 Allow Nulls tick

. AddressLine2
http://1.bp.blogspot.com/_-5Cl9WHU-Uo/SX1D9APdM5I/AAAAAAAADC0/kRjfMEIngdA/s1600-h/primary.png


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Column .

AddressLine2 Data .

.

rowguid uniqueidentifier Data Type .

Unique Identifier?

8DD27D89-6AE7-4316-B3B8-0CCEF0924F60 hexadecimal .

.

,

.

Unique Identifier Data Type Column

. .

row UniqueIdentifier .

:


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declare @a uniqueidentifier

set @a = newid()

print @a

.

F94771ED-8405-4C30-893E-0325FA0A394C

T-SQL programming .

T-SQL Transact SQL . .

@a variable. .

set @a = newid() ---> hexadecimal based variable @a .

print @a --> @a .


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F94771ED-8405-4C30-893E-0325FA0A394C . .

.

.

AddressLine1, AddressLine2, City, PostalCode Column DataType nVarchar

.

Column unicode , ,

.

AddressLine1 60 . 20 , 40 trim 20

table . varchar .

char

.

AddressID, StateProvinceID DataType int .

. AddressID Identity Column


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( auto increment ) .

StateProviceID .

Modified Date DataType DateTime

. Modified Date column

.

T-SQL .

declare @a datetime

set @a = getdate()print @a

@a datetime DataType .

getdate() function , .

print @a .

Jan 26 2009 11:00AM


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. Primary key, Identity Column

.

. 3 ,

4

.

,

.

Posted by at 8:45 PM

Labels: Self Learning Series
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