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Write a SQL query to count the number of duplicate TRANSACTION_ID in an ORDERS DB2 table
We can find the duplicate TRANSACTION_ID in the ORDERS DB2 table using the below query:
Example
SELECT TRANSACTION_ID, COUNT(*) AS TRANSACTION_COUNT FROM ORDER GROUP BY TRANSACTION_ID HAVING COUNT(*) > 1
The purpose of COUNT(*) is to count the number of rows. We will group the result based on the TRANSACTION_ID using GROUP BY function and to display the duplicate transaction ids, we will place a predicate using HAVING statement for COUNT(*) greater than one.
For example, consider the below TRANSACTIONS DB2 table:
TRANSACTION_ID | TRANSACTION_STATUS |
IRN22345 | PAID |
IRN22345 | PAID |
IRN22345 | PAID |
IRN56902 | PAID |
IRN99781 | UNPAID |
IRN56902 | PAID |
The query will give the below result:
TRANSACTION_ID | TRANSACTION_COUNT |
IRN22345 | 3 |
IRN56902 | 2 |
IRN99781 | 1 |
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