Collections:
Filtering Out Duplications in the Returning Rows in SQL Server
How To Filter Out Duplications in the Returning Rows in SQL Server?
✍: FYIcenter.com
If there are duplications in the returning rows, and you want to remove the duplications, you can use the keyword DISTINCT in the SELECT clause. The DISTINCT applies to the combination of all data fields specified in the SELECT clause. The tutorial exercise below shows you how DISTINCT works:
CREATE TABLE fyi_team (first_name VARCHAR(8), last_name VARCHAR(8)) GO INSERT INTO fyi_team VALUES ('John', 'Gate') GO INSERT INTO fyi_team VALUES ('John', 'Russell') GO INSERT INTO fyi_team VALUES ('John', 'Seo') GO INSERT INTO fyi_team VALUES ('John', 'Gate') GO INSERT INTO fyi_team VALUES ('James', 'Gate') GO INSERT INTO fyi_team VALUES ('Peter', 'Gate') GO INSERT INTO fyi_team VALUES ('John', 'Gate') GO SELECT * FROM fyi_team GO first_name last_name John Gate John Russell John Seo John Gate James Gate Peter Gate John Gate SELECT DISTINCT * FROM fyi_team GO first_name last_name James Gate John Gate John Russell John Seo Peter Gate SELECT DISTINCT last_name FROM fyi_team Gate Russell Seo
Remember that * in select list represents all columns.
⇒ Group Functions in Query Statements in SQL Server
⇐ Using SELECT Statements on Views in SQL Server
⇑ Using SELECT Statements and GROUP BY Clauses in SQL Server
2016-10-26, 1326🔥, 0💬
Popular Posts:
What Happens to Your Transactions When ERROR 1213 Occurred in MySQL? If your transaction receives th...
How to execute statements under given conditions in SQL Server Transact-SQL? How to use IF ... ELSE ...
Where to find answers to frequently asked questions on Transaction Management: Commit or Rollback in...
What Are the Underflow and Overflow Behaviors on FLOAT Literals in SQL Server Transact-SQL? If you e...
What Are the Underflow and Overflow Behaviors on FLOAT Literals in SQL Server Transact-SQL? If you e...