Home Accessibility Courses Twitter The Mouth Facebook Resources Site Map About Us Contact
 
For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
INSERT, DELETE, REPLACE and UPDATE - changing the content of SQL tables

Most enquires of an SQL database are SELECTs - most database are "Read Mostly" and writes are limited to a small proportion of accesses (though there are exceptions). And SELECTs are much more complex that things that insert or change data too.

However, I found myself writing en example on yesterday's MySQL course that shows most of the commands for amending data ...

INSERT to add new rows to a table

DELETE to remove rows from a table

REPLACE to replace complete rows, based on the primary key

UPDATE to alter data within existing rows

See examples of each of them [here].

also:

LOAD to insert a whole series of rows from data in a file

The commands above handle the data itself. If you want to handle the metadata (i.e. the information about the tables, such as their structure), you'll use CREATE TABLE to set up new tables and ALTER to amend the table structre.
(written 2010-11-19)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
S152 - SQL Primer as Used in MySQL
  [158] MySQL - LEFT JOIN and RIGHT JOIN, INNER JOIN and OUTER JOIN - (2004-12-20)
  [270] NULL in MySQL - (2005-04-06)
  [494] MySQL - a score of things to remember - (2005-11-12)
  [502] SELECT in MySQL - choosing the rows you want - (2005-11-22)
  [515] MySQL - an FAQ - (2005-12-03)
  [591] Key facts - SQL and MySQL - (2006-02-04)
  [2240] How do I query a database (MySQL)? - (2009-06-15)
  [3061] Databases - why data is split into separate tables, and how to join them - (2010-11-20)
  [4007] Which database should I use? MySQL v SQLite - (2013-02-16)


Back to
Object Orientation in an hour and other Perl Lectures
Previous and next
or
Horse's mouth home
Forward to
Databases - why data is split into separate tables, and how to join them
Some other Articles
On the way to the course this week
Comments in and on Perl - a case for extreme OO programming
Melksham Carnival - getting ready for 2011
INSERT, DELETE, REPLACE and UPDATE - changing the content of SQL tables
Object Orientation in an hour and other Perl Lectures
MacBook Air - hardware and system review
Lots of things to do with and within a C++ class
C++ - a complete example with polymorphism, and how to split it into project files
Zyliana Kyrei Cox
4759 posts, page by page
Link to page ... 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96 at 50 posts per page


This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

Link to Ezine home page (for reading).
Link to Blogging home page (to add comments).

You can Add a comment or ranking to this page

© WELL HOUSE CONSULTANTS LTD., 2024: 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01144 1225 708225 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho

PAGE: http://www.wellho.net/mouth/3060_.html • PAGE BUILT: Sun Oct 11 16:07:41 2020 • BUILD SYSTEM: JelliaJamb