How do you select and delete in SQL?

Posted on by Muna Meyer

How do you select and delete in SQL?

SQL DELETE Statement

  1. DELETE FROM table_name WHERE condition;
  2. Example. DELETE FROM Customers WHERE CustomerName=’Alfreds Futterkiste’;
  3. DELETE FROM table_name;
  4. Example. DELETE FROM Customers;

How do I delete a selected row in SQL Server?

To DELETE a single record :

  1. Syntax – DELETE FROM table_name WHERE condition;
  2. Example – A table named Student has multiple values inserted into it and we need to delete some value.
  3. Output – (1 row(s) affected)
  4. Output –
  5. Syntax – DELETE FROM table_name;
  6. Example –
  7. Output – (3 row(s) affected)

Can we use select in delete query?

SQL Deleting records with subqueries In this page, we are going to discuss, how SUBQUERIES (A SELECT statement within another SELECT statement can be used as a subquery )along with SQL DELETE command can be used to perform a deletion.

Can we delete record using select statement?

You need to identify the primary key in TableA in order to delete the correct record. The primary key may be a single column or a combination of several columns that uniquely identifies a row in the table. If there is no primary key, then the ROWID pseudo column may be used as the primary key.

What is the delete command in SQL?

The Delete command in SQL is a part of the Data Manipulation Language, a sub-language of SQL that allows modification of data in databases. This command is used to delete existing records from a table. Using this, you can either delete specific records based on a condition or all the records from a table.

WHERE exists delete SQL?

You may wish to delete records in one table based on values in another table. Since you can’t list more than one table in the SQL Server FROM clause when you are performing a delete, you can use the SQL Server EXISTS clause. For example: DELETE FROM employees WHERE EXISTS ( SELECT * FROM contacts WHERE contacts.

What is difference between truncate and delete command?

Key differences between DELETE and TRUNCATE The DELETE statement is used when we want to remove some or all of the records from the table, while the TRUNCATE statement will delete entire rows from a table. DELETE is a DML command as it only modifies the table data, whereas the TRUNCATE is a DDL command.

How do you delete a table from SQL database?

Using SQL Server Management Studio

  1. In Object Explorer, select the table you want to delete.
  2. Right-click the table and choose Delete from the shortcut menu.
  3. A message box prompts you to confirm the deletion. Click Yes. Deleting a table automatically removes any relationships to it.

What is delete command?

Delete command is a data manipulation command which is used to remove records from a table. All records may be removed in one go, or a set of records may be deleted based on a condition.

How do I delete a file in SQL Server?

In Object Explorer, connect to an instance of the SQL Server Database Engine and then expand that instance. Expand Databases, right-click the database from which to delete the file, and then click Properties. Select the Files page. In the Database files grid, select the file to delete and then click Remove.