To add, delete, or edit columns in an existing table, use the ALTER TABLE statement. The ALTER TABLE statement can also be used to add and remove constraints from a table.
When you wish to modify the name of your table or any table field, you use the ALTER statement in MySQL. It can also be used to add or remove columns from a table. Depending on the situation, the ALTER statement is always used with the "ADD," "DROP," and "MODIFY" commands.
ALTER TABLE Work:
COPY. Operations are performed on a copy of the original table, and table data is copied from the original table to the new table row by row.
INPLACE. Operations avoid copying table data but may rebuild the table in place.
INSTANT. Operations only modify metadata in the data dictionary.
A table's columns and indexes can be added or modified, the engine can be changed, foreign keys can be added, and the table name can be changed. Right-click a table name in the Navigator area of the sidebar with the Schemas secondary tab selected and select Alter Table to open the MySQL Table Editor.
The MySQL SELECT statement searches the database for rows/columns that match the criteria specified by the operator and returns them. Database administrators can retrieve, group, summarise, and analyse data using this MySQL query data method.
Learner's Ratings
4.2
Overall Rating
53%
33%
3%
0%
11%
Reviews
K
Karan kadam
5
thank you sir!!!
S
savnesh daksh
5
Good
S
Sparsh Gaur
4
arey kiske barabar
ARPIT ARORA
5
Error is 11:35:07 SELECT * FROM PRODUCTS group by PROD_CODE LIMIT 0, 1000 Error Code: 1055. Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'learn_vern.PRODUCT
S
Swapnil Chilwant
5
Well, a structured course, with amazing teaching techniques by meet shah sir Thank you, LearnVern team.
S
Sunil Bhargav
5
good
G
Ganesh Kandu
5
you didn't mentioned about self join
M
mukul kumar
4
please make a assignment solution video, explanation is very good
S
saurabh kushwah
5
Thank you LearnVern to teach us the best courses at no cost these courses are very amazing keep going and keep teaching as same as you doing. Please add DSA course also.
M
Manabendra Nath
4
Bahoot ascha samjhate hain lekin, thora sa slow samjhata hain jo thora booring lagte hain,(Just my opinion). Thank you.
Share a personalized message with your friends.