W3Schools SQL QuizSQL QUIZPoints: 25 out of 25 1. What does SQL stand for? You answered: Structured Query Language Correct Answer! 2. Which SQL statement is used to extract data from a database? You answered: SELECT Correct Answer! 3. Which SQL statement is used to update data in ...
DROP INDEX DROP INDEX table_name.index_name (SQL Server)DROP INDEX index_name ON table_name (MS Access)DROP INDEX index_name (DB2/Oracle)ALTER TABLE table_nameDROP INDEX index_name (MySQL) DROP TABLE DROP TABLE table_name EXISTS IF EXISTS (SELECT * FROM table_name WHERE id = ?)BEGIN-...
varmysql=require('mysql');varcon=mysql.createConnection({host:"localhost",user:"myusername",password:"mypassword",database:"mydb"});con.connect(function(err){if(err)throwerr;console.log("Connected!");//Make SQL statement:varsql="INSERT INTO customers (name, address) VALUES ?";//Make an...
Our database is empty, so we cannot query any tables yet, but we can check the version with this SQL statement: SELECTversion(); To insert SQL statements in the Query Tool, just write in the input box like this: Execute SQL Statements To execute a SQL statement, click the "Play" butt...
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To delete the record(s) where brand is 'Volvo', use this statement: Example Delete all records where brand is 'Volvo': DELETE FROM cars WHERE brand = 'Volvo'; Result DELETE 1 Which means that1row was deleted. Display Table To check the result we can display the table with this SQL ...
The following SQL statement selects all customers, and all orders:SELECT Customers.CustomerName, Orders.OrderID FROM Customers FULL OUTER JOIN Orders ON Customers.CustomerID=Orders.CustomerID ORDER BY Customers.CustomerName; Note: The FULL OUTER JOIN keyword returns all the rows from the left ...
Notice the WHERE clause in the UPDATE statement. The WHERE clause specifies which record(s) that should be updated. If you omit the WHERE clause, all records in the table will be updated! ❮ SQL Keywords Reference Track your progress - it's free! Log inSign Up...
Look at the example above again. The original purpose of the code was to create an SQL statement to select a user, with a given user id.If there is nothing to prevent a user from entering "wrong" input, the user can enter some "smart" input like this:UserId: ...
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