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If data is coming from Excel or a text file, then 255 characters as the JET engine truncates. I don't know about other sources, but I know internally that Tableau can handle longer strings.
For other data sources, 1,024 characters has been found to be the limit within Tableau. However, sometimes it will recognize more than that (for example, if using VARCHAR in MySQL)
I wanted to know the maximum limit of Tableau for string data type.
So could you please give me the exact size?
It depends on the data source. There is no documented max string length.