SQL - Fundamentals
SELECT, FROM, WHERE, ORDER BY, LIMIT, comparison operators, LIKE, IN, BETWEEN, NULL
1Which SQL keyword is used to retrieve data from a table?
Which SQL keyword is used to retrieve data from a table?
Answer
SELECT is the fundamental SQL keyword for querying and retrieving data from one or more tables. It forms the basis of every read query in SQL and is always followed by the desired columns or the asterisk (*) to select all available columns.
2Which SQL keyword specifies the table to search data from?
Which SQL keyword specifies the table to search data from?
Answer
FROM indicates the source table in an SQL query. It always follows SELECT and precedes filtering clauses like WHERE. Without FROM, the query does not know which table to search for the requested data.
3What does the query SELECT * FROM clients return?
What does the query SELECT * FROM clients return?
Answer
The asterisk (*) is a shortcut meaning "all columns". Combined with FROM clients, the query returns all columns and all rows from the clients table. This is useful for exploring a table but discouraged in production as it may return unnecessary data and slow down performance.
Which keyword is used to filter rows returned by an SQL query?
What is the correct order of clauses in a basic SQL query?
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