Unlock Your Potential with SQL WHERE Clause
What does the WHERE clause do in SQL?
Choose the correct option:
a. Filters rows based on specific criteria
b. Orders rows based on column values
c. Deletes rows from a table
d. Combines data from multiple tables
e. None of the above
Final answer:
The correct answer is a. Filters rows based on specific criteria.
SQL WHERE clause is a powerful tool that allows you to filter rows based on specific criteria. By using the WHERE clause, you can extract exactly the data you need from a table, making your queries more efficient and focused.
When you want to select rows that meet certain conditions, such as rows where the value of a column is greater than a certain number or rows where a column is not null, you can use the WHERE clause to specify these conditions.
For example, if you want to retrieve all rows from a table where the State column is not null, you can use the WHERE clause like this:
SELECT * FROM table_name WHERE State IS NOT NULL;This query will only return rows where the State column has a non-null value, excluding any rows with missing or unknown values.
By understanding how to effectively use the WHERE clause in SQL queries, you can take your data manipulation skills to the next level and unlock new possibilities in managing and analyzing databases.