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I have a table that has a string value of 'null' that I wish to replace with an actual NULL value.
However if I try to do the following in my select
Select Replace(Mark,'null',NULL) from tblname
It replaces all rows and not just the rows with the string. If I change it to
Select Replace(Mark,'null',0) from tblname
It does what I would expect and only change the ones with string 'null'
597
You can use String's replace() method to replace null with empty String in java. str = str. replace(null,""); As String is immutable in java, you need to assign the result either to new String or same String.
Null Values can be replaced in SQL by using UPDATE, SET, and WHERE to search a column in a table for nulls and replace them. In the example above it replaces them with 0.
We can replace NULL values with a specific value using the SQL Server ISNULL Function. The syntax for the SQL ISNULL function is as follow. The SQL Server ISNULL function returns the replacement value if the first parameter expression evaluates to NULL.
The steps are simple: Change the data type of the Date to a String (right-click on the field in the list of dimensions and Change Data Type) Right-click on the dimension again (once it's a string) and select Aliases. Set the Alias value for Null to be a space if you want it blank (or a “-“/dash/hyphen/minus/etc)
You can use NULLIF:
SELECT NULLIF(Mark,'null')
FROM tblname;
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