Working with SQL Training Videos for Beginner

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Working with SQL Training Videos for Beginner by
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Highlights

• SQL Introduction
• Basic SELECT statement
• WHERE clause
• Using wildcards in a WHERE clause
• Sorting results
• With INSERT statements
• With UPDATE statements
• With DELETE statements

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SQL Introduction

• SQL means Structured Query Language.
• Allows users to access and manipulate databases.
• SQL can execute queries against a database
• SQL can insert, update, delete records and can
  retrieve data from a database.
• SQL can create new databases, new tables, create
  stored procedures, create views in a database.
• Sets permissions on tables, procedures, and
  views.

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Basic SELECT statement

• Uses to select data from a database.
• Stores retrieved data in result-set named table.
• Syntax SELECT column1, column2, columnN FROM
  table_name or SELECT  FROM table_name
  
• Consider selecting one employee details like id,
  name, salary of a company would be follows as
• Syntax SELECT ID, NAME, SALARY FROM CUSTOMERS

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WHERE clause

• Extract particular records that fulfill a
  specific principle.
• Filter the results and applies conditions on
  SELECT, INSERT, UPDATE, or DELETE statements.
• Syntax SELECT column_name,column_name FROM tab
  le_name WHERE column_name operator value
• WHERE clause uses various operators to filter the
  results, they are equal, not equal, greater than,
  less than, greater than or equal, less than or
  equal, between, like, in.

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Using wildcards in a WHERE clause

• SQL supports two wildcard operators with LIKE
  operator. They are percentage(), underscore (_).
• Percentage matches one or more characters.
• Syntax SELECT FROM table_name WHERE column LIKE
  'XXXX or
• SELECT FROM table_name WHERE column LIKE
  'XXXX'
• Underscore (_) matches one character.
• Syntax SELECT FROM table_name WHERE column LIKE
  'XXXX_' or
• SELECT FROM table_name WHERE
  column LIKE '_XXXX_'

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Sorting results

• ORDER BY clause is used to sort the data
• Sorts either in ascending or descending order,
  based on columns.
• Syntax SELECT column-list FROM table_name WHERE
  condition ORDER BY column1, column2,
  .. columnN ASC DESC
• Sort the results in ascending order by NAME and
  SALARY follows as
• Syntax SELECT FROM CUSTOMERS ORDER BY NAME,
  SALARY
• INSERT  statement is used to add new rows of data
  to a table in the database.

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Sorting results

• Syntax INSERT INTO TABLE_NAME (column1, column2,
  column3,...columnN) VALUES (value1, value2,
  value3,...valueN)
• UPDATE Query is used to modify the existing
  records in a table.
• Syntax UPDATE table_name SET column1 value1,
  column2 value2...., columnN valueN WHERE
  condition
• DELETE Query is used to delete the existing
  records from a table.
• Syntax DELETE FROM table_name WHERE condition

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