What is modify command in SQL?

What is the difference between update and modify command?

Modify means it going to modify the record if it exists. If record is not there it going to add that record. Update means it is only modify the record.

What is modify a table?

Elements in a table can be inserted, changed, and deleted. These functions are all performed by the WRITE/TABLE or COPY commands (See Table 5.4). The element to be modified must be defined by giving its column and row location. An element is deleted if the value is set to NULL.

What is difference between add and modify in SQL?

ALTER SQL command is a DDL (Data Definition Language) statement. ... Difference Between ALTER and UPDATE Command in SQL :SR.NOALTER CommandUPDATE Command3ALTER Command is used to add, delete, modify the attributes of the relations (tables) in the database.UPDATE Command is used to update existing records in a database.

What is the use of modify alter command?

ALTER TABLE is used to add, delete/drop or modify columns in the existing table. It is also used to add and drop various constraints on the existing table.