What are different types of join in SQL Server?

Basic SQL JOIN types

• INNER JOIN. INNER JOIN statement returns only those records or rows that have matching values and is used to retrieve data that appears in both tables.
• OUTER JOIN.
• LEFT OUTER JOIN.
• RIGHT OUTER JOIN.
• SELF JOIN.
• CROSS JOIN.

How many types of joins are there in SQL Server?

4 different types
There are 4 different types of SQL Server joins: SQL Server INNER JOIN (or sometimes called simple join) SQL Server LEFT OUTER JOIN (or sometimes called LEFT JOIN) SQL Server RIGHT OUTER JOIN (or sometimes called RIGHT JOIN)

Is Left join left outer join?

There really is no difference between a LEFT JOIN and a LEFT OUTER JOIN. Both versions of the syntax will produce the exact same result in PL/SQL. Some people do recommend including outer in a LEFT JOIN clause so it’s clear that you’re creating an outer join, but that’s entirely optional.

When to use left join?

Use a left join when you want all the results from Table A, but if Table B has data relevant to some of Table A’s records, then you also want to use that data in the same query. Use a full join when you want all the results from both Tables.

What is left join in SQL?

LEFT JOIN. The SQL LEFT JOIN (specified with the keywords LEFT JOIN and ON) joins two tables and fetches all matching rows of two tables for which the SQL-expression is true, plus rows from the frist table that do not match any row in the second table.

What is left join access?

Use a LEFT JOIN operation to create a left outer join. Left outer joins include all of the records from the first (left) of two tables, even if there are no matching values for records in the second (right) table. Use a RIGHT JOIN operation to create a right outer join.

Can I join a table with itself in SQL Server?

SQL Server self join syntax. A self join allows you to join a table to itself. It is useful for querying hierarchical data or comparing rows within the same table. A self join uses the inner join or left join clause. Because the query that uses self join references the same table, the table alias is used to assign different names to the same table within the query.