Remember to write the text you are searching for in lowercase as well. The SQL LOWERfunction is a built-in string function that converts all characters in a given string to lowercase. Such a query will return all rows with some form of 'birch' string in the wood_type_used column, regardless of how the values are cased in the original data. Since values of the wood type are not consistently cased, simply querying for all rows that have 'birch' in the wood_type_used column would only return one row, even though two of the listed products are clearly made of birch. According to Microsoft's guidelines and Visual Studio's code analysis rule CA1308, I should be using C's String.ToUpperInvariant () instead of ToLower (). You may also find it helpful in case-insensitive queries, that is, queries in which it is irrelevant how the text data you are looking for is originally cased.įor instance, in our example table above, you might want to find all items made of birch wood. Depending on the context, I either use T-SQL's LOWER () function or C's String.ToLower () method to generate the lower case version of the user name to fill the LoweredUserName field. However, displaying text in a uniform way is not the only application of the LOWER() function. It returns a version of the original text data in which every uppercase letter is replaced by its lowercase equivalent, and the rest of the characters remain unchanged. This function takes as an argument a string or the name of a column whose text values are to be displayed in lowercase. SQL Server contains system functions for viewing / updating string data to both uppercase and lowercase but not proper case. Whenever you want some text data from your SQL database to be displayed in lowercase, use the LOWER() function. The query returns the items with wood types written in lowercase letters: code We would like all of the wood types to be displayed in lowercase. The case is inconsistent in the data in the wood_type_used column. Our database has a table named item with data in the following columns: id, code, and wood_type_used. In another way, you can say that in SQL Server, you can convert any uppercase string to lowercase by using the SQL LOWER() function. If the input isn't a character string, the output has the default collation of the database, and a collation label of coercible-default. You’d like to change some text to lowercase in SQL. When the CAST or CONVERT functions output a character string, and they receive a character string input, the output has the same collation and collation label as the input.
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