How to Delete Data From A Table In MySQL?

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To delete data from a table in MySQL, you can use the DELETE statement. Here is the syntax:

DELETE FROM table_name WHERE condition;

Let's break down the statement:

  1. "DELETE FROM" is the starting clause, which specifies that you want to delete data from a table.
  2. "table_name" refers to the name of the table from which you want to delete data.
  3. "WHERE" is an optional clause that allows you to specify conditions for the deletion. If omitted, all rows in the table will be deleted.
  4. "condition" is a logical expression that determines which rows should be deleted based on specific criteria.

Example: Suppose we have a table named "employees" with columns such as "id", "name", and "age". To delete an employee with id 101, the statement would be:

DELETE FROM employees WHERE id = 101;

This would remove the row from the table where the id column equals 101.

Remember, deleting data from a table is a permanent action, and it cannot be undone. So, exercise caution when using the DELETE statement.

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What is a database table?

A database table is a collection of data arranged in rows and columns. It is the fundamental structure in a relational database management system (RDBMS) where data is stored. Each row in a table represents a unique record or data point, while columns define the different attributes or fields of the data. Tables are used to organize and store data in a structured manner, providing a way for efficient data retrieval and manipulation through queries and operations.

What is the syntax for deleting a temporary table in MySQL?

To delete a temporary table in MySQL, you can use the following syntax:


Here, "DROP TEMPORARY TABLE" is the statement to delete the table, "IF EXISTS" is an optional clause to check for existence before deleting, and "table_name" is the name of the temporary table you want to delete.

What is the difference between DELETE and DROP in MySQL?

In MySQL, DELETE and DROP are two different operations with distinct purposes:

  1. DELETE: DELETE is used to remove records or rows from a table. It is primarily used to delete specific rows that meet certain criteria based on a condition specified in the WHERE clause of the DELETE statement. DELETE operation does not remove the table structure or schema, and the table remains intact with its columns and constraints.
  2. DROP: DROP is used to remove an entire table from the database. When you DROP a table, it permanently deletes the table structure, along with all the rows and data contained within it. This operation is essentially used to delete the entire table, including its columns, constraints, indexes, and any associated permissions or triggers.

In summary, DELETE is used to delete specific rows from a table, whereas DROP is used to delete the entire table from the database.

What is the syntax for deleting a row in MySQL?

To delete a row in MySQL, you can use the DELETE statement with the WHERE clause to specify the condition for deletion. The syntax is as follows:

DELETE FROM table_name
WHERE condition;

Here, table_name is the name of the table from which you want to delete the row, and condition is the condition that specifies which row or rows should be deleted. The condition can be based on one or multiple columns using various comparison operators like =, >, <, >=, <=, or <> (not equal).

For example, to delete a row with a specific value in the "id" column from a table named "users", you can use the following query:

WHERE id = 1;

This query will delete the row(s) that have an "id" value of 1 in the "users" table.

How to delete a row using LIMIT in MySQL?

In MySQL, the LIMIT clause is used to specify the number of records to return in a SELECT statement. It cannot be directly used to delete rows. However, you can achieve the desired functionality by using a subquery. Here's an example:

DELETE FROM table_name
    SELECT id
    FROM table_name
    WHERE condition
    ORDER BY column_name
    LIMIT n

Replace table_name with the name of your table, id with the primary key column in your table, condition with the condition that identifies the rows you want to delete, column_name with the column that determines the order of the rows, and n with the number of rows you want to delete.

By selecting the ids of the rows you want to delete in a subquery and then using the DELETE statement with the IN clause, you can delete the specific rows by limiting the number of rows returned by the subquery.

What is a primary key in MySQL?

In MySQL, a primary key is a unique identifier for each row in a table. It ensures that each record is uniquely identifiable within the table and helps in enforcing data integrity.

A primary key can be a single column or a combination of columns that uniquely identifies each record in the table. It must have a unique value for each row and cannot contain NULL values.

The primary key constraint prevents duplicate or null values from being inserted or updated in the primary key column(s). It also allows for efficient indexing and faster retrieval of data in the table.

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