Does SQL query automatically eliminate duplicates?
SQL queries can work without indexes, although indexes can improve performance. An SQL query automatically eliminates the duplicates: This is incorrect. By default, SQL queries do not eliminate duplicates. To remove duplicates, the DISTINCT keyword must be used. Lees verder »
Can a SQL query automatically eliminate the duplicates present?
SQL queries can work without indexes, although indexes can improve performance. An SQL query automatically eliminates the duplicates: This is incorrect. By default, SQL queries do not eliminate duplicates. To remove duplicates, the DISTINCT keyword must be used. Lees verder »
Does SQL remove duplicates?
SQL Server offers different methods of removing duplicate records from the database. These methods include using DISTINCT with INTO , ROW_NUMBER() , and temporary tables. Lees verder »
Why is MySQL query returning duplicates?
Duplicate records in a result set is usually a sign that you've got an incomplete join. For example, you might have a composite foreign key in the relationship between two tables, but you're only JOIN ing on one of the two fields on each table. Lees verder »
How to avoid duplicate values in SQL select query?
Set the field's Indexed property to Yes (No duplicates) You can do this by opening the table in Design view. This method is easy and a good choice if you only want to change one field at a time. Create a data-definition query that creates the unique index You can do this by using SQL view. Lees verder »
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