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Questions and Answers
What is the correct SQL statement to rename a table in a database?
What is the correct SQL statement to rename a table in a database?
- RENAME old_table TO new_table;
- ALTER old_table RENAME new_table;
- RENAME TABLE old_table TO new_table; (correct)
- ALTER TABLE old_table RENAME TO new_table;
How do you add a new column to an existing table in SQL?
How do you add a new column to an existing table in SQL?
- ADD COLUMN column_name TO table_name;
- INSERT INTO table_name (column_name) VALUES (datatype);
- ALTER TABLE table_name ADD column_name datatype; (correct)
- UPDATE table_name SET column_name = datatype;
What is the correct SQL statement to modify the datatype of a column in a table?
What is the correct SQL statement to modify the datatype of a column in a table?
- MODIFY COLUMN datatype IN table_name;
- ALTER TABLE table_name MODIFY COLUMN column_name datatype; (correct)
- UPDATE table_name SET column_name = datatype;
- CHANGE COLUMN column_name datatype IN table_name;
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Study Notes
Renaming a Table
- The correct SQL statement to rename a table is:
ALTER TABLE old_table_name RENAME TO new_table_name;
Adding a New Column
- To add a new column to an existing table, use the
ALTER TABLEstatement with theADD COLUMNclause:ALTER TABLE table_name ADD COLUMN new_column_name data_type;
Modifying a Column's Data Type
- To modify the data type of a column, use the
ALTER TABLEstatement with theMODIFYorALTER COLUMNclause:ALTER TABLE table_name MODIFY column_name new_data_type;orALTER TABLE table_name ALTER COLUMN column_name TYPE new_data_type;
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