I have multiple sheets, in the example, Sheet1 and Sheet2 that I would like to query that results in a single Master sheet. see the

Explanation

• {} means Array
  
• ; Stack ranges on top of eatch other
• , to jion columns side by side "we did't need in this example"
• "Select * Where Col1 is not null" Select all columns where column1 is not empty

Option 02 - without headers

=QUERY({ Sheet1!A2:C;Sheet2!A2:C }, "Select * Where Col1 is not null")