However, you may find yourself working with a database where duplicate rows have been created through human error, a bug in your application, or uncleaned data from external sources. This tutorial will teach you
Duplicate Records are the rows in our database that are identical to one another. For our sample dataset, we can see that there are three identical rows with the same name (“Mahesh Singh”), Department (Sales) and Salary (50000.00). Now let us discuss some methods used to find Duplicate...
In this post, we are going to see how to select distinct values from SQL queries/statements. One of the easiest ways to select distinct values is using the DISTINCT keyword. Let's explore this keyword first. DISTINCT DISTINCT is used to remove duplicate rows from the SELECT query and only ...
INNER JOIN SECOND_TABLE as ST ON ST.Question_ID=FT.Question_ID Where Userid=@userID so as my Second_Table has two rows for Question one it shows two result set due to inner join I have checked left , right all joins FOR QUESTION_ID=1 I have Two Recrods in the Second Table so...
Let’s find the number of different (and non-NULL) cities. Solution SELECTCOUNT(DISTINCTcity)ascities FROMcustomer; This query returns number of cities where customers live: cities 3 Discussion To count the number of different values that are stored in a given column, you simply need to desig...
Select Distinct in SQL A Brief on the SELECT Query in SQL The Select query in SQL is one of the most important commands in SQL, and it is used to get data from a table. Syntax SELECT column1, column2, columnN FROM tablename; where SELECT...
You can achieve this by using theJOINandGROUP BYclauses in SQL. Here's the query to create ...
In the below example, we retrieve data from all columns with where condition. We use the id, name, city, and phone column to retrieve the data. After using a distinct clause on all columns with the where condition, it will retrieve the unique values from the rows we defined in the wher...
Definition of SQL Select Distinct Count It is used to retrieve a number of counts from the specified column which was unique in values. We are using one column from which we want to retrieve the unique count of values. It is very useful and important in any RDBMS to retrieve the unique ...
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