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ASP FAQ Tutorials :: Databases :: Other Articles :: Why do I get 'Argument data type text is invalid for argument [...]'?


Why do I get 'Argument data type text is invalid for argument [...]'?

SQL Server TEXT columns are kind of special. Because of their size, and the fact that they're stored off-row, string manipulations must be considered wisely. Also, some of the functions that work for VARCHAR are not legal with TEXT. Here is a partial list (these samples assume a TEXT column called 'data'): 
 
-- getting the number of characters 
 
        SELECT LEN(data) 
    -- becomes 
        SELECT DATALENGTH(data) 
 
-- getting the first 5 characters 
 
        SELECT LEFT(data,5) 
    -- becomes 
        SELECT SUBSTRING(data,1,5) 
 
-- getting the last 5 characters 
 
        SELECT RIGHT(data,5) 
    -- becomes 
        SELECT SUBSTRING(data,DATALENGTH(data)-4,5) 
 
-- changing case 
 
        SELECT LOWER(data) 
        SELECT UPPER(data) 
    -- becomes 
        SELECT LOWER(SUBSTRING(data,1,DATALENGTH(data)) 
        SELECT UPPER(SUBSTRING(data,1,DATALENGTH(data)) 
 
If you are attempting to REPLACE a part of the string, you can play with the STUFF() function, or see Article #2445.

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Created: 10/28/2001 | Last Updated: 2/4/2003 | broken links | helpful | not helpful | statistics
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