How do you find the duplicate rows in a table with Integer ID and a varchar name fields? select * from [table_name] a where [varchar column] in (select [varchar column], count(*) from [table_name] group by [varchar column] having count(*) > 1) and ...
If we can assume there are just 2 rows per ID... no need to use a pivot. if however, it...
When using the UNION statement, keep in mind that, by default, it performs the equivalent of a SELECT DISTINCT on the final result set. In other words, UNION takes the results of two like recordsets, combines them, and then performs a SELECT DISTINCT to eliminate duplicate rows. This proce...
The IDENTITY column has the drawback that once generated, column values could be changed. Additionally, it might be necessary to designate this column as a PRIMARY KEY; as a result, there is a chance that some values in a table will duplicate. Only columns with an integer base are eligible...
Duplicate rows in a SQL Server database table can become a problem. We will see how we can find and handle those duplicate rows using T-SQL in this article. Read more » Development, Functions, SQL commands, T-SQL SQL Server JSON functions: a bridge between NoSQL and relational worl...
Find the difference between 2 consecutive rows in a sql table find the range between two decimal numbers Finding duplicate values for a set of columns in a table finding duplicate words/phrases in a string Finding Duplicates with DISTINCT and HAVING Finding last occurrence of a space in a strin...
This article explores SQL Count Distinct operator for eliminating the duplicate rows in the result set. Read more » Functions, SQL commands, T-SQL EXEC SQL overview and examples June 18, 2019 by Ranga Babu In this article, we will review on EXEC SQL statement in SQL Server and exp...
SQL Error [23505]: ERROR: duplicate key value violates unique constraint "emps_iden_pkey" Detail: Key (emp_id)=(2) already exists. SERIAL Usage In PostgreSQL, you can create a sequence similar to the IDENTITY property supported by identity columns. When you crea...
If a surrogate key is used on the many-to-many table in order to provide uniqueness and if the natural key does not have a unique constraint, then duplicate natural key combinations can occur. This can be obfuscated if there is additional information in the table. Maybe the amount the car...
Level2– perform two self-joins to find, for each row, the value of theEventTypefor the previous and then the subsequent rows, in each partition Level3– filter out unneeded rows and reapply row numbers Level4– perform another self-join to pair upENTERandEXITrows ...