Microsoft SQL Server Development for Everyone - Deleting Data from the Table Using an SQL Script

This video tutorial explains how to delete data from a database table using SQL commands. It covers deleting records by ID, using names with conditions, and employing wildcards for broader deletions. The tutorial emphasizes the importance of using unique identifiers like ID to avoid accidental deletions and highlights the irreversibility of delete operations. It also advises caution when using delete statements without conditions, as this can remove all records from a table.

What is the primary reason for using the ID column when deleting a student record?

• It is a unique identifier for each student.

• It is easier to remember than other columns.

• It contains the student's name.

• It is the first column in the table.

Which clause is used to specify conditions in a DELETE statement?

• ORDER BY

• WHERE

• SELECT

• GROUP BY

Why is it risky to delete records based on names?

• Names can be misspelled.

• Names are not unique identifiers.

• Names are too long to type.

• Names are stored in a separate table.

What should you do before experimenting with DELETE statements?

• Use SELECT statements to test conditions.

• Directly delete records to see the effect.

• Use UPDATE statements instead.

• Ignore the conditions and delete all records.

What is the purpose of using a wildcard in a DELETE statement?

• To delete all records in the table.

• To create a backup of the table.

• To target records with specific patterns in their names.

• To update records with new values.

What happens to the ID column after records are deleted?

• It duplicates the remaining IDs.

• It resets and recounts from 1.

• It remains unchanged.

• It becomes empty.

What is a potential consequence of executing a DELETE statement without a WHERE clause?

• The database crashes.

• The table structure is altered.

• Only the first record is deleted.

• All records in the table are deleted.