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JOINS SQL
THEORY
By
ARUN
The SQL JOIN is a command clause that combines
records from two or more tables in a database. It is a
means of combining data in fields from two tables by
using values common to each table. If you're working
with databases, at some point in your work you will
likely need to use SQL JOINs
(INNER) JOIN: Returns dataset that have matching values in both tables
LEFT (OUTER) JOIN: Returns all records from the left table and matched records from the right
RIGHT (OUTER) JOIN: Returns all records from the right table and the matched records from the left
FULL (OUTER) JOIN: Returns all records when there is a match in either the left table or right table
SELECT column_name(s)
FROM table1
INNER JOIN table2
ON table1.column_name = table2.colum n_name;
 The syntax of the SQL JOIN statement is: SELECT columns_from_both_tables FROM table1 JOIN table2
ON table1.column1 = table2.column2. Here, table1 and table2 are the two tables that are to be joined.
Different types of JOINS in SQL Server
INNER JOIN
LEFT OUTER JOIN
RIGHT OUTER JOIN
SELF JOIN
CROSS JOIN
SELF JOIN − is used to join a table to itself as if the table were two
tables, temporarily renaming at least one table in the SQL statement.
CROSS Join − returns the Cartesian product of the sets of records from
the two or more joined tables.
SELF JOIN Syntax
The following expression illustrates the syntax of
SELF JOIN in SQL Server.
It works the same as the syntax of joining two
different tables.
Here, we use aliases names for tables because
both the table name are the same.
1.SELECT T1.col_name, T2.col_name...
2.FROM table1 T1, table1 T2
3.WHERE join_condition;
Thank YOU

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JOINS.pptx

  • 2. The SQL JOIN is a command clause that combines records from two or more tables in a database. It is a means of combining data in fields from two tables by using values common to each table. If you're working with databases, at some point in your work you will likely need to use SQL JOINs (INNER) JOIN: Returns dataset that have matching values in both tables LEFT (OUTER) JOIN: Returns all records from the left table and matched records from the right RIGHT (OUTER) JOIN: Returns all records from the right table and the matched records from the left FULL (OUTER) JOIN: Returns all records when there is a match in either the left table or right table
  • 3.
  • 4. SELECT column_name(s) FROM table1 INNER JOIN table2 ON table1.column_name = table2.colum n_name;  The syntax of the SQL JOIN statement is: SELECT columns_from_both_tables FROM table1 JOIN table2 ON table1.column1 = table2.column2. Here, table1 and table2 are the two tables that are to be joined.
  • 5. Different types of JOINS in SQL Server INNER JOIN LEFT OUTER JOIN RIGHT OUTER JOIN SELF JOIN CROSS JOIN
  • 6. SELF JOIN − is used to join a table to itself as if the table were two tables, temporarily renaming at least one table in the SQL statement. CROSS Join − returns the Cartesian product of the sets of records from the two or more joined tables.
  • 7. SELF JOIN Syntax The following expression illustrates the syntax of SELF JOIN in SQL Server. It works the same as the syntax of joining two different tables. Here, we use aliases names for tables because both the table name are the same. 1.SELECT T1.col_name, T2.col_name... 2.FROM table1 T1, table1 T2 3.WHERE join_condition;