Explain how each of the eight cost estimation strategies can be paired with a variety of heuristic rules during query optimization by the DBMS, and describe the impact that this has on lowering the amount of work that a DBA needs to do.

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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.