asp.net - Retrieve data from one table that is not in another one -

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sq = "select roomno,blockname roommanage roomno not in( select *from availableroom)"; ds = dc.filldata(sq); gridview1.datasource = ds.tables["t1"]; gridview1.databind();

there error:

only 1 expression can specified in select list when subquery not introduced exist.

how can solve this?

in "not in" should return 1 column. try below code.

sq = "select roomno,blockname roommanage roomno not in( select id availableroom)";     ds = dc.filldata(sq);     gridview1.datasource = ds.tables["t1"];     gridview1.databind();

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