I have a table with child records that I need to get records of a certain type that have not been processed.

Summary
All records where workctr = 'INS' and operations before it have been closed.

the table structure

recseq mainindex operation operation_date workctr

123 999 10 02/23/2015 MFG
456 999 20 02/23/2015 DFM
789 999 30 INS

122 888 10 02/22/2015 MFG
133 888 20 DMF
144 888 30 INS

This is what I have but will not work because it give the 'INS' even if operation before it are open.

testconnString = "Select MIN(operation) as operation, twono, workctr From webprddt1.drawmtwop" +;
" Join webprddt1.drawmtwo On webprddt1.drawmtwo.recseq = webprddt1.drawmtwop.twono" +;
" Where datec Is NULL And operationd Is NULL And workctr = 'INS' Group By twono, workctr"