Select command in SQL is one of the most powerful and heavily used commands. This is I guess the first command any one learn in SQL even before CREATE which is used to create table in SQL. SELECT is used in SQL to fetch records from database tables and you can do a lot many things using Select. For example you can select all records, you can select few records based on condition specified in WHERE clause, select all columns using wild card (*) or only selecting few columns by explicitly declaring them in query.
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