Which clause is used to filter out unwanted data in SQL?
3. Which clause is used to “Filters out unwanted data”? Explanation: None.
Which clause is used to filter a query?
FILTER is a modifier used on an aggregate function to limit the values used in an aggregation. All the columns in the select statement that aren’t aggregated should be specified in a GROUP BY clause in the query.
Which statement is used to remove a trigger?
Which statement is used to remove a trigger? Explanation: In order to delete a trigger, the DROP TRIGGER statement is used. The DROP TRIGGER construct is used by writing the phrase ‘DROP TRIGGER’ followed by the scheme name specification.
Is duplicate entry of primary key is allowed in SQL?
It is not possible to have more than one row in the same table with the same primary key (PK). If you are doing a SELECT and getting more than one row with the same PK could be because: … The SELECT statement is not correct.
How do I exclude a row in SQL?
The EXCEPT operator is used to exclude like rows that are found in one query but not another. It returns rows that are unique to one result. To use the EXCEPT operator, both queries must return the same number of columns and those columns must be of compatible data types.
What is the use of in and like clause?
The SQL LIKE Operator
The LIKE operator is used in a WHERE clause to search for a specified pattern in a column. There are two wildcards often used in conjunction with the LIKE operator: The percent sign (%) represents zero, one, or multiple characters. The underscore sign (_) represents one, single character.
Which clause is similar to having clause in SQL?
Explanation: “HAVING” clause are worked similar as “WHERE” clause.
WHERE is used to filter rows?
To filter rows and columns: Right-click a row or column member, select Filter, and then Filter. In the left-most field in the Filter dialog box, select the filter type: Keep: Include rows or columns that meet the filter criteria.
Which clause limits or filters the records of aggregated queries?
Discussion: To filter records according the given number of rows in the group, use the HAVING clause. It filters rows using in a condition aggregate function like COUNT.
What is difference between WHERE and HAVING clause in SQL?
A HAVING clause is like a WHERE clause, but applies only to groups as a whole (that is, to the rows in the result set representing groups), whereas the WHERE clause applies to individual rows. A query can contain both a WHERE clause and a HAVING clause. … The HAVING clause is then applied to the rows in the result set.