Question

You are working with very large tables in your database. Which SQL clause do you use to prevent exceedingly large query results?

a) LIMIT
b) GROUP BY
c) DISTINCT
d) WHERE

Answer 1

To prevent exceedingly large query results from large tables in a database, the LIMIT clause is used to restrict the number of rows a SQL query returns.

Step-by-step explanation:

When working with very large tables in a database and looking to prevent exceedingly large query results, you would use the LIMIT clause. The LIMIT clause is used to constrain the number of rows returned by a SQL query. For example, if you only need a small number of records from a query on a large table, you could use the LIMIT clause as follows:

SELECT * FROM large_table LIMIT 10;

This would return only the first 10 records from the table 'large_table'. In contrast, the options (b) GROUP BY, (c) DISTINCT, and (d) WHERE serve different purposes. GROUP BY is used to group rows that have the same values in specified columns into summary rows, DISTINCT is used to remove duplicate rows from the results, and WHERE is used to filter records based on specific conditions.