Question

i am using ADO.NET Data Provider for SQLite: 1.0.82.0

Aggregate function returns wrong result:

###Table structure###
CREATE TABLE ta85 (id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, date INTEGER, _90 REAL, _100 REAL)

###Rows: ###
select * from ta85

id, date, _90, _100

"1","1355480577920","4,4","2"

"2","1355480877929","15","5,2"

"3","1355481177937","26,4","9,4"

------------------

Now if i want to select the max, min values for each column:

SELECT date,MIN(_90), MAX(_90),MIN(_100), MAX(_100) FROM ta85 WHERE date between 1355480296794 and 1355481366266

returns:

"1355481177937","15","4,4","2","9,4" 

which for column _100 is correct but for column _90 is wrong.

Solution

Thanks for all your answers. you were both right.

cmd.Parameters.AddWithValue(columname,"");

to

cmd.Parameters.AddWithValue(columname,0.0d);

Answer 1

It appears you are comparing strings instead of numbers. Perhaps format your number as ‘4.4’ instead of the ‘4,4’