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Asked: 2026-05-23T19:27:52+00:00

I have a database table with a field that has values such as AAAA

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I have a database table with a field that has values such as

AAAA
BBBB0001
BBBB0002
CCCC
CCCC
CCCC

and I would like to know how many AAAAs, BBBBs and CCCCs there are (1, 2 and 3 here).

If I set up a couple of test queries in LinqPad with those values in an array:

var Table = new [] {"AAAA", "BBBB1", "BBBB2", "CCCC", "CCCC", "CCCC"};

var query1 = Table.GroupBy(d => d).Select( g => new { K = g.Key, C = g.Count()});
query1.Dump();

var query2 = Table.GroupBy(d => d.Substring(0, 4)).Select( g => new { K = g.Key, C = g.Count()});
query2.Dump();

then I get the results I expect – in the first case grouped by the key and in the second grouped by the first four characters of the key

AAAA    1
BBBB1   1
BBBB2   1
CCCC    3

AAAA    1
BBBB    2
CCCC    3

which is fine. But if replace the array by a SQLite table and run the same queries, what I get is

AAAA    1
BBBB1   1
BBBB2   1
CCCC    3

AAAA    1
BBBB    1
BBBB    1
CCCC    3

That is, the first is correct, while in the second, the field is being correctly shortened but the grouping is wrong.

Anyone cast any light on this?

Andrew

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1 Answer

  1. Editorial Team

    What connector are you using for your linq to sqlite? It feels like it’s likely to be a bug in that connector.

    e.g. Looking at the revision table for dotconnect – http://www.devart.com/dotconnect/sqlite/revision_history.html – then there are plenty of group by bugs that they’ve found and fixed in recent months – and I’m sure there could be others in there.

    Unless you absolutely need sqlite, then you could consider switching to SQL CE – in which case you’d get more direct support for Linq from Microsoft.

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