- Tags: Keyword
- Categories: Reference, SQL Keywords, SQL Reference
Quick Reference
CREATE TABLE
The following creates a table called Customers that contains six columns: id_customer, first_name, last_name, address, city, state, country.
CREATE TABLE Customers (
id_customer int,
first_name varchar(255),
last_name varchar(255),
address varchar(255),
city varchar(255),
state varchar(255),
country varchar(255)
);
The following creates a new table called “Users” by copying two of the columns from the Customers table.
CREATE TABLE Users AS
SELECT first_name, last_name
FROM Customers;
ALTER TABLE
The following adds the last_name column to the Customers table.
ALTER TABLE Customers
ADD last_name varchar(255);
DROP TABLE
The following deletes the table Customers.
DROP TABLE Customers;
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SQL NOTES:
- Any work being done to modify the structure of a database or delete tables or the the database itself should only be done after making a recent backup
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