DELETE DELETE FROM table_nameWHERE some_column=some_value or DELETE FROM table_name (Note: Deletes the entire table!!) DELETE * FROM table_name (Note: Deletes the entire table!!) DROP DATABASE DROP DATABASE dat
19. With SQL, how can you delete the records where the "FirstName" is "Peter" in the Persons Table? You answered: DELETE FROM Persons WHERE FirstName = 'Peter' Correct Answer! 20. With SQL, how can you return the number of records in the "Persons" table? You answered: SELECT COUNT...
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
DELETEThe DELETE command is used to delete existing records in a table.The following SQL statement deletes the customer "Alfreds Futterkiste" from the "Customers" table:Example DELETE FROM Customers WHERE CustomerName='Alfreds Futterkiste'; Try it Yourself » ...
connect(function(err) { if (err) throw err; /*Delete the "customers" table, but only if it already exist (to avoid errors):*/ var sql = "DROP TABLE IF EXISTS customers"; con.query(sql, function (err, result) { if (err) throw err; console.log(result); }); }); { ...
Exercise: SQL Create TableWhat is the primary purpose of the SQL CREATE TABLE statement?To create a new table in a database To insert data into a table To join a table To delete a table from a databaseSubmit Answer » What is an Exercise? Test what you learned in the chapter: ...
SQL Server / Oracle / MS Access: ALTERTABLEPersons DROPCONSTRAINTCHK_PersonAge; MySQL: ALTERTABLEPersons DROPCHECKCHK_PersonAge; TheDROP DEFAULTcommand is used to delete a DEFAULT constraint. To drop a DEFAULT constraint, use the following SQL: ...
ALTER TABLE cars ADD color VARCHAR(255); Result ALTER TABLE Display Table To check the result we can display the table with this SQL statement: Example SELECT * FROM cars; Run Example » As you can see, thecarstable now has acolorcolumn. ...
SQL Injection Based on Batched SQL Statements Most databases support batched SQL statement. A batch of SQL statements is a group of two or more SQL statements, separated by semicolons. The SQL statement below will return all rows from the "Users" table, then delete the "Suppliers" table....