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How to reduce column size in MySQL database?
Not only can you double-check if everything is okay, it probably is also faster. CREATE TABLE new_adv LIKE adv; ALTER TABLE new_adv MODIFY COLUMN id VARCHAR (80), MODIFY COLUMN index INT (11); INSERT INTO new_adv SELECT * FROM adv; RENAME adv TO old_adv, new_adv TO adv; /*when everything is okay…*/ DROP TABLE old_adv;
How to change the data type for a column in MySQL?
I want to change the data type of multiple columns from float to int. What is the simplest way to do this? There is no data to worry about, yet. Depending on how many columns you wish to modify it might be best to generate a script, or use some kind of mysql client GUI
How to reduce column size and data type?
CREATE TABLE new_adv LIKE adv; ALTER TABLE new_adv MODIFY COLUMN id VARCHAR (80), MODIFY COLUMN index INT (11); INSERT INTO new_adv SELECT * FROM adv; RENAME adv TO old_adv, new_adv TO adv; /*when everything is okay…*/ DROP TABLE old_adv; And by the way, it’s a good idea not to use keywords like index for column names.
What’s the maximum row size for a mySQL table?
The maximum row size for the used table type, not counting BLOBs, is 65535. You have to change some columns to TEXT or BLOBs Thanks for contributing an answer to Stack Overflow!
How are tables deleted but database size does not change?
20GB Tables are deleted in my database but database size does not change and disk size showing same size. When you create a database and assign it gigabytes of space based on a capacity planning that space is kind of a reserved space.
How to change the size of a column in SQL?
To change column size use ALTER TABLE query as shown below: Let us consider students table with the following schema. The name column is of datatype varchar and size 5. To increase the size of the column, we shall run the following SQL Query. Now, let us see the modified schema if the column size has updated.