The clause alter table in SQL can be used to
Question
The clause alter table in SQL can be used to
Solution
The ALTER TABLE statement in SQL is used to add, delete/drop or modify columns in an existing table. You can also use the ALTER TABLE command to add and drop various constraints on an existing table.
Here are some examples:
- Add a column:
ALTER TABLE table_name
ADD column_name datatype;
- Delete a column:
ALTER TABLE table_name
DROP COLUMN column_name;
- Modify the data type of a column:
ALTER TABLE table_name
MODIFY COLUMN column_name datatype;
- Add a constraint:
ALTER TABLE table_name
ADD CONSTRAINT constraint_name constraint_type(column_name);
- Drop a constraint:
ALTER TABLE table_name
DROP CONSTRAINT constraint_name;
Remember to replace table_name, column_name, datatype, constraint_name, and constraint_type with your actual table name, column name, data type, constraint name, and constraint type.
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How can you change "EmployeeName" column datatype to VARCHAR(50) in an "Employees" table?ALTER TABLE Employees MODIFY EmployeeName VARCHAR(50); CHANGE TABLE Employees MODIFY EmployeeName VARCHAR(50); ALTER TABLE Employees CHANGE EmployeeName VARCHAR(50);None of the above
ect the correct answerWhich SQL statement is used to make changes to the structure of an existing table without deleting it?OptionsDELETE TABLEMODIFY TABLEALTER TABLECHANGE TABLE
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