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AskSQLTeam
Ask SQLTeam Question
0 Posts |
 Posted - 2007-02-12 : 21:55:10
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| Jan writes "Is it possible to have in your database a column that is automatically the results of another column. Here is my problem, I am using a report writer that does not allow BIT data types. I need to use the data found in the BIT column, so I am wondering if I can create a column that triggers its values from another column in the DB. My new column type will be TINYINT. Then in my report I will use the values in new column that contiains the values from the BIT column. Any help or suggestions would be appreciated." |
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khtan
In (Som, Ni, Yak)
17689 Posts |
Posted - 2007-02-12 : 22:02:00
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is both the columns on the same table ? why not use computed column ?
KH |
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jsorenso
Starting Member
3 Posts |
Posted - 2007-02-13 : 14:28:31
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| Both columns are in the same table. Will a computed column make column B column A? |
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SwePeso
Patron Saint of Lost Yaks
30421 Posts |
Posted - 2007-02-13 : 15:06:05
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Yes.quote:
Computed columns can be used in select lists, WHERE clauses, ORDER BY clauses, or any other locations in which regular expressions can be used, with the following exceptions: Computed columns used as CHECK, FOREIGN KEY, or NOT NULL constraints must be marked PERSISTED. A computed column can be used as a key column in an index or as part of any PRIMARY KEY or UNIQUE constraint if the computed column value is defined by a deterministic expression and the data type of the result is allowed in index columns. For example, if the table has integer columns a and b, the computed column a + b can be indexed, but computed column a + DATEPART(dd, GETDATE()) cannot be indexed because the value may change in subsequent invocations. A computed column cannot be the target of an INSERT or UPDATE statement.
Peter LarssonHelsingborg, Sweden |
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jsorenso
Starting Member
3 Posts |
Posted - 2007-02-14 : 10:17:32
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| My only problem with a computed column is the fact that when I set column B to Column A, Column B mimics Column A in type. I need Column B to be a tinyint where as column A is a BIT type. If I set as the formula for column B, Column A, then I get a BIT type for Column B. I need Column B to be TinyInt. Can a formula be constructed such that if I set column B to column A the column type can change to something else? |
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khtan
In (Som, Ni, Yak)
17689 Posts |
Posted - 2007-02-14 : 10:28:29
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you can use convert() to convert it in the formula
KH |
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jsorenso
Starting Member
3 Posts |
Posted - 2007-02-14 : 17:08:52
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| Brilliant solution, the computed column in conjunction with cast() worked. It was simple, elegant and truely a "Flowing Fount of Yak Knowledge" Thanks all. |
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Triggering one column to equal another column