Find Duplicate Values with SQL Script

Let’s assume that data has been entered in a table and now you want to find if a table column have duplicated values. Here is an SQL script to join data from one table for comparison purpose. The table must have a primary key column (unique column) and the second column for comparison. Here is a sample script: Details: – DWDOCID is the primary key column – AIXFlag, is just a fixed value (optional) – SAMPLEEN is the table…

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FORMAT Function for Transact-SQL – T-SQL

Returns a value formatted with the specified format and optional culture in SQL Server 2016. Use the FORMAT function for locale-aware formatting of date/time and number values as strings. FORMAT ( value, format ) Return Types:  nvarchar or null The length of the return value is determined by the format. Remarks:   FORMAT returns NULL for errors other than a culture that is not valid. For example, NULL is returned if the value specified in format is not…

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T/SQL Splint String/Text

One common task performed in database applications is given a full name, how can this be split into the first name and last name.  In this article, three different methods are discussed to perform this task using three different functions in SQL Server.  It is assumed in this article that the full name is just made up of one first name and one last name. Using SUBSTRING Function The first method is the use of the SUBSTRING string function,…

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T/SQL Generate Random Numbers

SQL Server has a built-in function that generates a random number, the RAND() mathematical function.  The RAND math function returns a random float value from 0 through 1.  It can take an optional seed parameter, which is an integer expression (tinyint, smallint or int) that gives the seed or start value. To use it, you can simply do a simple SELECT, as follows: SELECT RAND() AS The result generated by this SELECT statement is as follows (note that…

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T-SQL Comma Delimited Output

One of the common tasks performed when retrieving data from a SQL Server database is returning the result as a comma-delimited output instead of a result set.  This task can be performed by using a CURSOR selecting the column to be concatenated together.  Each row returned by the CURSOR is then concatenated together into a variable separating each one by a comma. Here’s how the script will look like using the table in the Northwind database. A sample…

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Get Numbers from Alpha Numeric String – Get Numeric Numbers Only

So, someone had stored thousands of SSN numbers in a table but now they have an issue because some of them are incomplete or are not correctly formatted. Thank you to blog.sqlauthority.com and little creativity I have come up with a SQL script that fixes this issue. Here is the T/SQL script:

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SELECT columns using the LIKE keyword

Using the WHERE clause to return on the records in the Employee table where the employees are a manager of some type. This example uses the % character for any number of characters. Using the LIKE keyword to return records from the Person table where users’ first names end in “ary”. This example uses the _ characters to represent a single character. Using the LIKE keyword to return records from the Person table where users’ first names end in…

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Selecting Domain from Email Address

Recently I came across a quick need where I needed to retrieve domain of the email address. The email address is in the database table. I quickly wrote following script which will extract the domain and will also count how many email addresses are there with the same domain address.

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