Explain selection union projection operation in DBMS?

1 answer

1179264

2026-08-19 19:40

Selection: Filters rows in a table based on a specified condition, creating a subset of rows that meet the criteria.

Union: Combines the results of two or more SELECT statements into a single result set, removing duplicates.

Projection: Selects specific columns from a table or result set, returning only the desired columns and discarding the rest.

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