DELETE in SQL vs. DROP in SQL: Know the Difference

By Shumaila Saeed || Published on February 6, 2024

DELETE in SQL removes specific records from a table, maintaining the table's structure, whereas DROP in SQL completely removes a table or database, including its structure and data.

DELETE in SQL vs. DROP in SQL

Key Differences

DELETE in SQL is used to remove one or more rows from a table, allowing the table structure to remain intact, unlike DROP, which removes the entire table or database.

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While DELETE operations can be rolled back if used within a transaction, DROP commands are irreversible, permanently deleting the table or database structure.

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DELETE allows for conditional removal of data using a WHERE clause, targeting specific records, whereas DROP removes all data and the table or database structure unconditionally.

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After using DELETE, the space occupied by the removed data can be reused for new data in the same table, but DROP frees up space by deleting the table itself.

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DELETE can affect table relationships and integrity constraints if foreign keys are involved, but DROP eliminates these concerns by removing the entire table or database.

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Comparison Chart

Action

Removes specific rows from a table

Removes an entire table or database

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Structure Impact

Maintains table structure

Deletes table structure

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Reversibility

Can be rolled back within a transaction

Irreversible

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Usage

Conditional removal with WHERE clause

Unconditional removal

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Space Reusability

Freed space can be reused in the same table

Frees up space by removing the structure

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Transaction Safety

Can be transaction-safe

Not transaction-safe

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Impact on Integrity

Affects table relationships and integrity

Removes relationships and constraints altogether

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Syntax

DELETE FROM [table] WHERE [condition];

DROP TABLE [table]; or DROP DATABASE [database];

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Target

Specific rows based on conditions

Entire table or database without conditions

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Common Use

Cleaning up data, maintaining structure

Removing obsolete tables or databases

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DELETE in SQL and DROP in SQL Definitions

DELETE in SQL

Can use a WHERE clause to specify which rows to delete.

DELETE FROM Employees WHERE Department = 'Sales';

Jan 25, 2024

DROP in SQL

Frees up storage space by removing entities.

DROP DATABASE TestEnvironment;

Jan 25, 2024

DELETE in SQL

Affects the data in a table but not its structure.

DELETE FROM Users WHERE Username = 'john_doe';

Jan 25, 2024

DROP in SQL

Command to completely remove a table or database.

DROP TABLE Inventory;

Jan 25, 2024

DELETE in SQL

Capable of being rolled back in a transaction.

BEGIN TRANSACTION; DELETE FROM Products WHERE Quantity = 0; ROLLBACK;

Jan 25, 2024

DROP in SQL

Does not allow conditional removal, deletes everything.

DROP TABLE ArchivedLogs;

Jan 25, 2024

DELETE in SQL

Command to remove specific rows from a table.

DELETE FROM Customers WHERE Age < 18;

Jan 25, 2024

DROP in SQL

Irreversible action that cannot be rolled back.

DROP TABLE TemporaryData;

Jan 25, 2024

DELETE in SQL

Used to selectively erase data while preserving the table.

DELETE FROM Orders WHERE OrderDate < '2020-01-01';

Jan 25, 2024

DROP in SQL

Used to delete the structure along with the data.

DROP DATABASE OldRecords;

Jan 25, 2024

Repeatedly Asked Queries

What does DELETE do in SQL?

DELETE removes specific rows from a table based on conditions.

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Can DELETE in SQL be undone?

Yes, if used within a transaction, DELETE can be rolled back.

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Does DELETE remove table structure?

No, DELETE only removes data, not the structure of the table.

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Does DELETE command affect database size?

DELETE may not immediately reduce database size, as it only removes data.

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Can DROP command be part of a transaction?

DROP can be included in transactions, but it's irreversible.

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Can DROP in SQL be conditional?

No, DROP is unconditional and removes the entire table or database.

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Is DROP reversible in SQL?

No, once executed, DROP cannot be reversed.

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How quick is DROP in SQL?

DROP is generally faster as it removes entire structures without checking data.

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What is the main purpose of DROP in SQL?

DROP is used to completely remove a table or database, including its data and structure.

Feb 06, 2024

What happens to the data after a DELETE command?

The data specified in the DELETE command is removed, but the table remains.

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Is DELETE in SQL fast?

DELETE speed depends on the number of rows and complexity of conditions.

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Does DELETE operation lock the table?

DELETE can lock the table temporarily during the operation.

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Can I use DELETE to remove all rows in a table?

Yes, but it's more efficient to use TRUNCATE for this purpose.

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How does DROP command affect database size?

DROP reduces database size by removing tables or entire databases.

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What if DROP is used without specifying a table?

Using DROP without specifying a table or database results in an error.

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Are there alternatives to DELETE for removing data?

Yes, TRUNCATE is an alternative for deleting all rows more efficiently.

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Can DELETE be used with a WHERE clause?

Yes, DELETE is often used with a WHERE clause for conditional deletion.

Feb 06, 2024

Will DROP operation lock the database?

DROP may lock the database briefly as it removes structures.

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Is DROP used for cleaning data?

No, DROP is for removing entire tables or databases, not for cleaning data.

Feb 06, 2024

What's the risk with using DROP?

The risk is accidentally deleting important structures and data irreversibly.

Feb 06, 2024

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About Author

Written by

Shumaila Saeed, an expert content creator with 6 years of experience, specializes in distilling complex topics into easily digestible comparisons, shining a light on the nuances that both inform and educate readers with clarity and accuracy.

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