Excel function to make SQL-like queries on worksheet data?

I have a largish table in an Excel worksheet:

Column_1 | Column_2 | Column_3

ValueA       ValueB     ValueC
....

What I need is a function that will take as input the range and an SQL-like query String and return a range of rows that match the query, e.g.:

=SQL_SELECT(A1:C1000, "SELECT * WHERE Column_1 = ValueH AND Column_3 = blah")

Does something like this exist? Or what would be the best way to implement myself?

You can use Get External Data (despite its name), located in the 'Data' tab of Excel 2010, to set up a connection in a workbook to query data from itself. Use From Other Sources From Microsoft Query to connect to Excel

Once set up you can use VBA to manipulate the connection to, among other thing, view and modify the SQL command that drives the query. This query does reference the in memory workbook, so doesn't require a save to refresh the latest data.

Here's a quick Sub to demonstrate accessing the connection objects

Sub DemoConnection()
    Dim c As Connections
    Dim wb As Workbook
    Dim i As Long
    Dim strSQL As String
    
    Set wb = ActiveWorkbook
    Set c = wb.Connections
    For i = 1 To c.Count
        ' Reresh the data
        c(i).Refresh 
        ' view the SQL query
        strSQL = c(i).ODBCConnection.CommandText
        MsgBox strSQL
    Next
End Sub

If you can save the workbook then you have the option to use ADO and Jet/ACE to treat the workbook as a database, and execute SQL against the sheet.

The MSDN information on how to hit Excel using ADO can be found here.

One quick way to do this is to create a column with a formula that evaluates to true for the rows you care about and then filter for the value TRUE in that column.

If you want run formula on worksheet by function that execute SQL statement then use Add-in A-Tools

Example, function BS_SQL("SELECT ..."):

Sometimes SUM_IF can get the job done.

Suppose you have a sheet of product information, including unique productID in column A and unit price in column P. And a sheet of purchase order entries with product IDs in column A, and you want column T to calculate the unit price for the entry.

The following formula will do the trick in cell Entries!T2 and can be copied to the other cells in the same column.

=SUMIF(Products!$A$2:$A$9999,Entries!$A2, Products!$P$2:$9999)

Then you could have another column with number of items per entry and multiply it with the unit price to get total cost for the entry.