Which of the following regarding joins is true? O A join can be a strain on database resources. The most common join is an outer join. O A join's usefulness stems from its ability to merge database files. O Joins are facilitated through relationships between primary keys.

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SQL Query

Structured Query Language is the full form of SQL. It is one of the standard languages to deal with the relational database. It is used to insert, update, delete, and search the records stored in a RDBMS. The relational databases are created and managed by using SQL.