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How to Check for Duplicates Before Inserting Into SQL

When you insert new records into an SQL database, you may run into issues where you accidentally overwrite records that are already present due to a duplication issue. You can use a simple alteration ... read more

Checking for duplicates before doing an INSERT

Before making an INSERT, how could I check with an SQL statement if the value exists already ... Let's say that out of 100 attempted inserts, 5 will be duplicates. In the select-analyse-insert strateg... read more

Loading CSV Files Using Dynamic SQL

Speaking at SQL ... into the database. You will also need to check to see if the file already has a corresponding table, and if does, you will need to see if the data that you are importing already ex... read more

Inserting Data Into a Database Using Batch Job

To insert data into a database using ... allows you to run diverse SQL operations on your database, including Select, Insert, Update, Delete, and even Stored Procedures. To use a database connector in ... read more

SQL Server Query Design

Before I get to the syntax, however, there are a few formalities to deal with. There are dozens of Transact-SQL commands ... You can also insert data into a table based on the result of a SELECT state... read more

Get Rid of Duplicates!

From time to time, and for whatever reasons, we all experience it: duplicate values appear in a table for a field that should be unique. For me, this issue recurs because of an application that tries ... read more

Fixing a Race Condition

Unfortunately we didn’t add uniqueness constraints at the database level when we created the scheduling system back in 2013, so a race condition somewhere can still add duplicate interviewers into ... ... read more

10 Easy Steps to a Complete Understanding of SQL

As in: "machine, do this, and then do that, but before, run a check and fail if this-and-that ... most beginners are probably tricked into thinking that column values are the first-class citizens in S... read more

How to avoid duplicates of Oracle delimited codes in CLOB column

Earlier, the application allowed duplicate ... check, it takes more time for me. Could you please give me some clarity on this? I think it might be faster to scan the CLOB for an occurrence of the 10 ... read more

How to Check for Duplicates Before Inserting Into SQL

The Structured Query Language's INSERT statement adds new records to database tables. In some business situations, duplicates pose problems, especially for master tables such as customers, products or ... read more

Adding Indexes to a Table

You also can use an index as a quick way to check for uniqueness. If you are inserting a new name into the index structure shown earlier, you simply search for the new name in the index. If you find i... read more