SQL Commands for Data Analysis

Home/SQL/SQL Commands for Data Analysis

SQL Commands will help Analyst to create database,creating new tables and views, update or deleting the existing data. SQL commands help to fetch the data from the database and format it to required standards and summarize to perform analysis.

PREMIUM TEMPLATES LIMITED TIME OFFER

ON SALE80% OFF

50+ Project Management Templates Pack
Excel PowerPoint Word

Advanced Project Plan & Portfolio Template
Excel Template

Business Presentations Templates Pack
PowerPoint Slides

20+ Excel Project Management Pack
Excel Templates

20+ PowerPoint Project Management Pack
PowerPoint Templates

10+ MS Word Project Management Pack
Word Templates


SQL Data Manipulation Language – DML Commands

The Data Manipulation Language (DML) is used to insert and modify database information.
Different DML statements includes:

–INSERT: to add records into the table
–UPDATE: to change column value in the table
–DELETE: to remove rows from the table

DML -INSERT Query

SQL INSERT statement allows to insert single or multiple records into the tale.

Syntax

[code language=”sql”] INSERT INTO table
(column-1,column-2,…column-n)
(value-1, value-2, … value-n);

Example

The following example insert a new record into Employee table,[code language=”sql”] INSERT INTO Employee(EID, Department, Name, Salary)
VALUES( 11,’HR’, ‘MICHAEL’,35000);

DML -UPDATE Query

UPDATE QUERY is used to update existing records in the table.

Syntax

[code language=”sql”] UPDATE table SET column1=value1,column2=value2… WHERE condition;

Example

The following example update the Mike’s salary to 35000 in the Employee table,[code language=”sql”] UPDATE Employee SET Salary= 35000 WHERE Name = ‘Mike’;

DML -DELETE Query

DELETE QUERY is used to delete selected rows,or all rows from the table.

Syntax

[code language=”sql”] DELETE from table WHERE condition;

Example

The following example dlete the record where EID equals to 10 from the Employee table,[code language=”sql”] DELETE from Employee WHERE EID=10;

SQL Data Definition Language – DDL commands

The Data Definition Language (DDL) is used to create and destroy databases and database objects.

These commands are:
–CREATE: to create a new data structure.
–ALTER: to change an existing data structure.
–DROP: to remove an entire data structure.
–TRUNCATE : to remove all rows from table.
–RENAME : to rename existing table.

CREATE

SQL command that adds a new table or View to an SQL database. Tables are a basic unit of organization and storage of data in SQL.

Syntax:[code lanuage=”sql”] CREATE TABLE <table_name> (
<column_name1> <datatype1> <constraint1>
<column_name2> <datatype2> <constraint2>
<constraint-list>
) ;

ALTER

SQL command can be used to add, modify, or drop a column from the existing table or to rename a table.

Syntax:[code lanuage=”sql”] Alter table <table name> add <column name><data type>;

DROP

The SQL command that removes the entire table.

Syntax:[code lanuage=”sql”] Drop <table name>;

Note: Before table drop must remove the dependent constraints

TRUNCATE

The SQL command that removes the entire table.

Syntax:[code lanuage=”sql”] TRUNCATE table <table name>;

RENAME

The SQL command that removes the entire table.

Syntax:[code lanuage=”sql”]

ALTER TABLE table_name RENAME TO new_table_name;

SQL Data Control Language – DCL commands

Data Control Language provides database administrators with the ability to grant users database permissions, revoke permissions previously granted .

Twp types of DCL commands are:Grant and Revoke.

GRANT

To allow specified users to perform specified tasks.[code language=”sql”] SYNTAX:-GRANT [privilege]ON [object]TO [user][WITH GRANT OPTION]

REVOKE:

Removes user access rights or privileges to the database objects.[code language=”sql”] REVOKE [GRANT OPTION FOR] [permission]ON [object]FROM [user]

SQL Transaction Control Language – TCL commands

SQL Transaction Control Language commands are used for managing changes affecting the data.

These commands are COMMIT, ROLLBACK and SAVEPOINT.

COMMIT :

Save or enable DML changes to the database.

Syntax:[code language=”sql”] COMMIT;

ROLLBACK:

To undo DML changes till in a transaction.

Syntax:[code language=”sql”] ROLLBACK SavePoint-Name;

SAVEPOINT:

To divide a transaction.

Syntax:[code language=”sql”] SAVEPOINT SavePoint-Name;

LIMITED TIME OFFER
By |February 13th, 2013|SQL|1 Comment

About the Author:

PNRao is a passionate business analyst and having close to 10 years of experience in Data Mining, Data Analysis and Application Development. This blog is his passion to learn new skills and share his knowledge to make you expertise in Data Analysis (Excel, VBA, SQL, SAS, Statistical Methods, Market Research Methodologies and Data Analysis Techniques).

One Comment

  1. Sanjay gupta April 5, 2016 at 9:38 PM - Reply

    Hello i want to use DCL : Grant And Revoke In Sql Server 2012, How Can I Use It tell Me….

Leave A Comment


Related pages


ado sql connection stringapplication.wait excel vbaexcel combine duplicate rowsvba lastrowexcel userform tutorial pdfdelete row in vbaexcel vba chr functionlistbox userform vbahow to develop macros in excelactivate a workbookexcel look up functionmerge rows in excelunprotect excel macroexcel vba switch caseresource planning spreadsheet templateddl commands in sql with syntaxmicrosoft outlook questions and answersexcel count duplicate valuesstatistical chart typesnest if statements in excelarrays in excel vbadelete columns vbaexcel 3d surface chartsumifs formula in excelif statements in excel 2010formula vlookup excel 2007copy and paste vbasum if in sqlexcel find last cellexcel vlookup functionssubstitute function in excelfilter out duplicates in exceldelete all blank rows in excelexecutive dashboard templatesvba unprotect sheet without passwordrept function excelbatch file append to text fileadvanced excel macrovba typeofhow we use vlookup in excelexcel formulas explaineddatabase interview questions for freshersexcel vba activecellcopy worksheet to another worksheethow to activate macro in excel 2007excel vba range sortmessage box in vbabasics of sasworking with pivot tables in excel 2007how to use sum if formulavlookup function excel 2013workbook vs worksheetaccess 2013 activex controlsexcel developers tabvba saveas fileformatclearcontents vbavb6 write text fileexcel vlookup rangeiserror formula excelhow to unlock a password protected excel workbookddl and dml commands in sql pdfexcel formula sortsumifs excel 2007change row height in excelsas predictive modeling tutorialhow to use averageif function in excel 2010project reporting template excelcommonly asked interview questions with answers for freshersvb calculatorhow to make excel sheet password protectedexcel vlookup examplesexcel lookup valueexcel vba switch statementvba msofiledialogfilepicker