How can I phrase this SQL command?

[Alex Dransfield]

I am having trouble with writing this SQL command. Basically, I have 4 checkboxes on my form and I want to populate a DataGridView depending on how the checkboxes are ticked. The user can have 0, 1, 2, 3 or all 4 of the checkboxes ticked, meaning that I have 15 different commands to write (if my maths is correct).

For example...

if(ocrChecked and aqaChecked)
{
sqlCommand = "...";
}

or...

if(ocrChecked and edexcelChecked)
{
sqlCommand = "...";
}

.

If you don't understand what I mean then I will try to explain it better, but in the mean time if anyone has any suggestions on how I could do this without having to do it inefficiently then please let me know.

By inefficient, I mean that I would have to do...

if(a b c d)
if(a b c)
if(a b d)
if(a d c)
if(b c d)
if(a b)
if(a c)
if(a d)
if(b c)
if(b d)
if(c d)
if(a)
if(b)
if(c)
if(d)

Thanks!

[hype261]

In these situations I just dynamically create the SQL command to execute. So for 4 check boxes you would do something like this.

string sql = "Select * FROM SomeTable ";
string where = "WHERE "

if(a)
{
where = where + " Something = true AND "
}

if(b)
{
where = where + " SomethingElse = true AND "
}

... Other check boxes

//check to see if any of the check boxes were true
if(where.Length > 6)
{
//remove the last AND from the string
where.Remove(where.Length - 5);

sql = sql + where;
}

Hope this helps