access and update in one instruction.
access and update in one instruction.
If you are referring to the use of the auto-increment/decrement operator, it is expressed more simply, and in some hardware architectures it is a hard-wired machine instruction, resulting in a faster program.
"Auto-increment" usually refers to automatically incrementing a field in a table to the next integer. This is usually used to create a unique key value for a record. The computer automatically puts the next value in the key field as soon as the record is created, so the user doesn't need to worry about that housekeeping feature.
When creating the MySQL database select "Auto-Increment" on the "Extras" bar.
To update a field in a table to be auto-increment, you typically need to modify the column definition using an ALTER TABLE statement. In SQL, you can run a command like: ALTER TABLE table_name MODIFY column_name INT AUTO_INCREMENT;. Make sure the column is set as a primary key or has a unique constraint, as auto-increment fields must be unique. Additionally, ensure that the existing values in the column do not conflict with the auto-increment sequence.
Storage classes.
auto, extern, static, register, typedef (only formally)
In Mysql: No You will get error :Invalid default value for 'id'
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Yes, you do.
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Just give an auto increment value in a column and retrive it in order dec. Then you get output in lifo order