The ALTER TABLE statement
is used to add, delete, or modify columns in an existing table.
The ALTER TABLE statement
is also used to add and drop various constraints on an existing table.
To add a column in a table,
use the following syntax:
ALTER TABLE table_name
ADD column_name
datatype;
The following SQL adds an
"Email" column to the "Customers" table:
ALTER TABLE Customers
ADD Email
varchar(255);
This post will help you to learn zoom something one your webpage like Image, div, table, or any HTML component in a simple way.
img
{
width: 100%;
transition: all 1s;
}
A typical laser printer has a resolution of 1,200 dots per
inch, or dpi. It achieves this level of detail through the use of microscopic
toner powder, high-performance electronics and precision optics. Many laser
printers have color capability at the same high resolution. Some dot matrix
printers achieve 240 dpi by making repeated passes over the same printed area,
though documents produced this way take at least twice as long to print as
those printed at normal quality. As a dot matrix printer's output color depends
on the ribbon, virtually none offer choices beyond black and red.
A typical desktop laser printer turns out about four full-color pages per minute; for black-and-white text, this rises to 25 pages per minute. Dot matrix printers are typically rated at between 200 and 600 characters per second, or about 50 pages per minute in draft mode. Some high-output dot matrix printers achieve 1,100 characters per second, or 100 pages per minute, although the print quality is low-resolution text.
