Ms sql update string concatenation

The resulting string is given an Alias of FullName so we can easily identify it in our resultset.. In this article, we have seen how to append strings to one another using string concatenation functions provided in SQL.

We hope you will find many uses for using these string functions in your databases. Subscribe to our free weekly newsletter and get exclusive SQL tips and articles straight to your inbox.

This allows you to provide the string and the number as two separate arguments. SQL Server will then concatenate them, and your concatenation is complete. This function allows you to specify a separator. Add a comment. Active Oldest Votes. Marc B Marc B k 40 40 gold badges silver badges bronze badges. The concat function in 4. I have somewhat the same senario, except i want to replace all the double quotes with single quotes.

Any suggestions how can i do that? This was a good answer, but a little confusing, since on my server 'data' was a keyword. Perfect solution. Rohan Khude Rohan Khude 3, 5 5 gold badges 46 46 silver badges 41 41 bronze badges. It uses a blank string '' when it runs into null values.

The request syntax was correct, but "0 line affected" when executed. Jeremy Thille Jeremy Thille Often, you want to know if a record has changed; meaning one or more columns have been updated. For example when loading data into a dimension table. When you have incoming data and you compare this with the current data in a table, comparing each individual column is not efficient, especially when the table has a lot of columns.

An option for a quick check is calculating a row hash. If the hash of the current row in the table is different from the incoming row, you know that at least one column has a different value. To calculate the hash for an entire row, we first need to concatenate all columns together into one single value.

Let's calculate a hash for the Person table with the following SQL commands:. You'll definitely want to use a separator, otherwise you might get "collisions": different rows who result in the same hash. For example, if you don't use a separator, the following the rows will return the same hash:.

Such collisions can easily be avoided by adding a separator. If you have a lot of nullable columns, a collision can often happen, especially if you use a lot of flag columns columns with the bit data type as in this example:.

Since the concatenation results in '10' each time, all the rows have the same hash. A dummy value is not always a good idea. For example, suppose you have an integer column that can contain any values an integer can hold.