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phpHow to get the files which are not in database 2015-07-19

let me describe my problem as clear as i can. 1st. i have the following table on my database ------------------ | id | url | ------------------ | 1 | file1.mp3 | ------------------ | 2 | file2.mp3 | ------------------ | 3 | file3.mp3 | --------------

sqlSelecting the columns which are not null from a tuple 2015-08-08

Imagine if we have a table: | col1 | val1 | val2 | val3 | val4 | val5 | ------------------------------------------- | A | 1 | null | null | null | 1 | | B | null | 1 | null | 1 | null | | C | 1 | null | 1 | null | null | and can i write an SQL query

c#LINQ select items from set A which are not in set B 2015-08-10

I would like to perform an Except operation on set of items. Code is like this: IEnumerable<DataGridViewColumn> dgvColumns = dataGridView.Columns.OfType<DataGridViewColumn>(); IEnumerable<DataColumn> dsColumns = dataSet.Tables[0].Columns
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