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-...
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varmysql=require('mysql');varcon=mysql.createConnection({host:"localhost",user:"myusername",password:"mypassword",database:"mydb"});con.connect(function(err){if(err)throwerr;console.log("Connected!");//Add primary key to an existing table:varsql="ALTER TABLE customers ADD COLUMN id INT...
W3Schools Spaces is a website-building tool that enables you to create and share your own website. You can also get a Python server, or PHP server (among others), allowing you to develop and host your Python/PHP++ applications with ease....
CREATE TABLE TheCREATE TABLEcommand creates a new table in the database. The following SQL creates a table called "Persons" that contains five columns: PersonID, LastName, FirstName, Address, and City: Example CREATETABLEPersons ( PersonID int,...
You can update existing records in a table by using the "UPDATE" statement:ExampleGet your own Node.js Server Overwrite the address column from "Valley 345" to "Canyon 123": var mysql = require('mysql'); var con = mysql.createConnection({ host: "localhost", user: "yourusername", ...
The following SQL creates an index named "idx_lastname" on the "LastName" column in the "Persons" table: CREATEINDEXidx_lastname ONPersons (LastName); If you want to create an index on a combination of columns, you can list the column names within the parentheses, separated by commas:...
CREATE VIEW In SQL, a view is a virtual table based on the result set of an SQL statement. TheCREATE VIEWcommand creates a view. The following SQL creates a view that selects all customers from Brazil: Example CREATEVIEW[BrazilCustomers]AS...
W3Schools Spaces is a website-building tool that enables you to create and share your own website. You can also get a Python server, or PHP server (among others), allowing you to develop and host your Python/PHP++ applications with ease....
varmysql=require('mysql');varcon=mysql.createConnection({host:"localhost",user:"myusername",password:"mypassword",database:"mydb"});con.connect(function(err){if(err)throwerr;/*Connect two tables by using one field from each table as the connection point:*/varsql="SELECT users.name AS ...