I've got a history table that performs a similar function. except in my
case I can have more than 1 active row. I put in an "is_active" column
and defined the type as a bool. an enum is actually a String in mysql,
which i didn't want to deal with. This table has only a few thousand
rows, so performance is not impacted at all.
jeff
sean c peters wrote:
I have some data that is stored by the year it is related to. So I have one
table that stores the Year the data is related to, among other things. At any
given time, 1 year is considered the 'active year', and the rest are
considered inactive.
The table is something like:
CREATE TABLE Data_Info
Data_Info_IDINT,
YearINT,
...
So my question is how do i best store which year is active. 2 designs come to
mind:
1) add a column such as:
Status ENUM('Active', 'Inactive')
and adjust accordingly as the active year changes.
2) have a separate table:
CREATE TABLE Active_Data (
Data_Info_IDINT,
Key (Data_Info_ID),
FOREIGN KEY (Data_ID) References Data_Info(Data_Info_ID)
);
With design 1, i need to make sure that only 1 record is ever set as 'Active'.
With design 2, there will only ever be 1 record in the Active_Data table.
Neither idea seems very good to me.
Any suggestions?
thanks much
sean peters
[EMAIL PROTECTED]
mysql, query
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