Course Content

  • SQl Join Practicals

Course Content

FAQs

SQL commands are the instructions that tell a database how to perform activities, functions, and queries on data. SQL commands can be used to search the database as well as do other tasks such as creating tables, adding data to tables, changing data, and dropping tables.

SQL joins are a very common technique to build queries in databases. There are three types of joins: Inner, Left, and Right.

  • Inner join - This is the most common type of join in SQL. It matches all the rows from one table with all the rows from another table where there is a match between values of columns that appear in both tables.
  • Left join - A left join matches all the rows from one table with all the rows from another table where there is a match between values of columns that appear in both tables, but not matching values on columns that do not appear in both tables.
  • Right join - A right join will match all the rows from one table with all the rows from another table where there is a match between values of columns that appear in both tables.

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