If you actually want to remove the table definitions as well as the data, simply drop the tables.
TRUNCATE TABLE empties it, but leaves its structure for future dat Like TRUNCATE TABLE CUSTOMER.
Removes all rows from a table without logging the individual row deletions
ON UPDATE CASCADE is used for checking data in the table after ALTER operation.
Example: Alter table emp add constraint Unique Key (DID) ON UPDATE CASCADE. This will restrict the update operation if any dublicate values exists.
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Choose the correct option.
SQL data definition commands make up a(n) ________ .
Index is created to make the searches (select query) faster. But to use the index we need to write the SQL select statement using the column on which we created the Index.
Example: Create index indx1 on emp (empno). To use the benefits, we have to write select * from emp where empno > 0;
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Choose the correct option.
In which three cases would you use the USING clause? (Choose three.)
AThe tables to be joined have columns of the same name and different data types.
BThe tables to be joined have multiple NULL columns.
CThe tables to be joined have columns with the same name and compatible data types.
DYou want to use a NATURAL join, but you want to restrict the number of columns in the join condition.
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