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    SQL Task Presentation: Naveen J

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    Ferenc Zombori
    This document discusses an SQL task involving creating a database for an organization's attendance portal. It includes tables for attendance, employees, permissions, leave, and departments. The document then covers various SQL topics like keys, joins, subqueries, string functions, datetime functions, and stored procedures. Examples are provided for each topic to demonstrate the concepts.

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    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd

    SQL Task Presentation: Naveen J

    Uploaded by

    Ferenc Zombori
    61 views14 pages
    This document discusses an SQL task involving creating a database for an organization's attendance portal. It includes tables for attendance, employees, permissions, leave, and departments. The document then covers various SQL topics like keys, joins, subqueries, string functions, datetime functions, and stored procedures. Examples are provided for each topic to demonstrate the concepts.

    Original Description:

    SQL presentation

    Original Title

    SQL PPT

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    This document discusses an SQL task involving creating a database for an organization's attendance portal. It includes tables for attendance, employees, permissions, leave, and departments. The document then covers various SQL topics like keys, joins, subqueries, string functions, datetime functions, and stored procedures. Examples are provided for each topic to demonstrate the concepts.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    61 views14 pages

    SQL Task Presentation: Naveen J

    Uploaded by

    Ferenc Zombori
    This document discusses an SQL task involving creating a database for an organization's attendance portal. It includes tables for attendance, employees, permissions, leave, and departments. The document then covers various SQL topics like keys, joins, subqueries, string functions, datetime functions, and stored procedures. Examples are provided for each topic to demonstrate the concepts.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 14

    SQL Task

    presentation
    Naveen J
    Business problem
    To create a database for attendance portal of a organisation and to perform
    exercise on the Sql topics given for that the following table are included

    ● Attendance table
    ● Employee detail
    ● Permission detail
    ● Leave detail
    ● Department detail
    Topics
    ● Keys
    ● Joins
    ● Subqueries
    ● String functions
    ● Datetime functions
    ● Stored procedures
    Keys
    Keys in sql are the set of attributes that is used to specify the particular
    column in a table and to find or to create a relation between the tables in a
    database in this task I have used keys are as follows

    Primary Key

    Foriegn Key

    Unique key
    joins
    Joins are used to retrieve data from different tables by combining the two or
    more tables with the help of relation between the tables. There are different
    types of joins used in sql.

    ● Inner join
    ● Right Join
    ● Left Join
    ● Outer join
    Example
    To find the employee who are taken leave or
    permission in two days and the status of the
    request.

    In this query right join retrieve the common data


    on request_id and all data on permission_detail.

    Then left join fetch the common data on ld.req_id


    and all data left table and union combine all the
    data from both query
    Example
    The employee applied both
    permission and leave on two days
    and status of the request

    In this query combine


    emp_detail,leave_detail and
    permission_detail by inner join it
    returns only common rows between
    the tables
    Subqueries
    A subquery is a another sql query that present inside the query. The result of
    the subquery is used in the main query to obtain result.there are different
    types of subqueries

    ● Scalar subquery
    ● Multiple row subquery
    Example

    First query is to find the employee detail who has the


    salary more than the average salary this query is a
    example for scalar subquery.

    Second is to fetch the employee detail who joined the


    company before the manager kavitha this query is ex
    for nested query and multiple row subquery.
    String functions
    String functions in Sql are used to manipulate the string datas in the table .

    There are many String functions in SQL from that i have used

    Lower,Upper,concat,reverse and substring


    Example
    First query to return the first_name
    and last_name are combined as full
    name in separate column

    Second query return first_name in


    lower case and reversed then
    last_name first two letters in
    uppercase inside the braces
    Datetime functions
    Datetime in Sql used to manipulate date time data present in the table by
    changing the date time format,extract particular parameter on the date time
    column and calculate the difference between two date time datas

    Curdate,datediff,day name,month name and timediff are some date time


    functions used
    Example
    To calculate the employee
    age,experience with the company
    and day of joining , month of joining
    Procedures
    stored procedure is a set of statements that perform some defined actions.
    We make stored procedures so that we can reuse statements that are used
    frequently.

    ● Without parameter
    ● With parameter

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