A SQL join clause combines records from two or sometimes more than two tables in to a database. This creates a set that can be used as it is or can be saved as a table.
join combine the two table to gv a resultant set
Join is used to combine related tuples from two relations . Full outer join cover all possible combinations of common tuples.
Outer Join in SQL is used to retrieve all records from one table and only matching records from another table. It helps to retrieve data from related tables even if there are no matching records in one of the tables.
Inner Join
Cross Join is jsut another Join
Left Inner Join will be faaster
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A Join SQL clause is a combination of two or more tables from a database. Fields are joined by using data that is present in both tables and are written as an identification for the join.
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In SQL, the function of the union operator is to combine the result of two or more select-statements. The union operator is a very useful tool when coding SQL.
glue
When you want to extract data from two or more tables, you can use a SQL JOIN query. By using JOIN clauses, you can combine rows from different tables based on a related column between them. This allows you to retrieve data from multiple tables in a single query.