Asked by: Yohana Preidlerasked in category: General Last Updated: 2nd June, 2020
What is the use of distinct clause in SQL?
Consequently, what is the use of distinct in SQL?
The SQL DISTINCT keyword is used in conjunction with the SELECT statement to eliminate all the duplicate records and fetching only unique records. There may be a situation when you have multiple duplicate records in a table.
Furthermore, what is the purpose of the SQL select top clause? The SQL SELECT TOP Clause The SELECT TOP clause is used to specify the number of records to return. The SELECT TOP clause is useful on large tables with thousands of records. Returning a large number of records can impact performance.
Considering this, how do we use distinct statement what is its use?
The SELECT DISTINCT statement is used to return only distinct (different) values. Inside a table, a column often contains many duplicate values; and sometimes you only want to list the different (distinct) values.
What is having clause in SQL?
A HAVING clause in SQL specifies that an SQL SELECT statement should only return rows where aggregate values meet the specified conditions. The HAVING clause filters the data on the group row but not on the individual row. To view the present condition formed by the GROUP BY clause, the HAVING clause is used.