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24 sty 2013 · A column can only return one data type - DATETIME != string/VARCHAR. If you want a zero length string in the event of the value being NULL, you have to explicitly change the data type, using CAST/CONVERT to change the non-NULL value to a VARCHAR/etc data type.
24 paź 2014 · I would like to convert a datetime field to varchar so I can show a blank or a message when the date is NULL. This is what I have so far: select. isnull(us.Date,0) as USDate, isnull(au.Date,0) as AUDate. from ustable us. left join autable au. on us.column=au.column. Right now this is showing: USDATE . 2014-10-24 10:29:07.450.
6 cze 2024 · The IS NULL operator checks whether the column contains null values. To detect empty values within the column, we compare it against the empty string (”). Sometimes, a column might contain values that consist only of spaces, especially when data is imported from various sources.
The SQL Server ISNULL() function lets you return an alternative value when an expression is NULL: SELECT ProductName, UnitPrice * (UnitsInStock + ISNULL(UnitsOnOrder, 0)) FROM Products;
In MySQL, 0 or NULL means false and anything else means true. The default truth value from a boolean operation is 1. NULL instead of death <>. NULL. Two NULL values are regarded as equal in a GROUP BY. When doing an ORDER BY, NULL values are presented first if you do ORDER BY ... ASC and last if you do ORDER BY ...
4 sty 2011 · If you use NULL you have to do WHERE columnX=<searchvalue> or (columnX is NULL and searchvalue is NULL). The second, more complicated logic, is indeed what you have to do in Oracle, as NULL and '' are the same thing there.
@DateFrom and @DateTo are input parameters that may be NULL. If they are both null, then I need to basically ignore the BETWEEN and return all records. If @DateFrom is NULL, but @DateTo is NOT NULL, then I need to return all records with DateCreated being no greater than @DateTo (inclusive).
