how to create SQL with WHERE 3 conditions or criteria using a MySQL database and a combobox in VB.NE

Dear Sir,

I  to create SQL with WHERE 3 conditions or criteria using a MySQL database and a combobox in VB.NEt

Please guide me

So I want 3 criteria, namely all (which means all), Project (which means taking from IDCUSTOMER that starts with the word "Project"), and non-project (which means taking from IDCUSTOMER that does not start with the word "Project")

 Sample table

Tabelsales
INVNO  IDCUSTOMER
1000   PROJECT001
1001   CUST001
1002   PROJECT045 
1003   CUST002

TabledetailI
NVNO  PRODUCT  QTY
1000   A1      10
1000   A2      25
1001   A2      80
1001   A3      75
1002   A2      80
1002   A10     88
1003   A12     35

Desiredresult
where condition all
NVNO  PRODUCT  QTY IDCUSTOMER
1000   A1      10   PROJECT001
1000   A2      25   PROJECT001 
1001   A2      80   CUST001 
1001   A3      75   CUST001
1002   A2      80   PROJECT045 
1002   A10     88   PROJECT045
1003   A12     35   CUST002

where condition Project
NVNO  PRODUCT  QTY IDCUSTOMER
1000   A1      10   PROJECT001
1000   A2      25   PROJECT001 
1002   A2      80   PROJECT045 
1002   A10     88   PROJECT045

where condition nonProject
NVNO  PRODUCT  QTY IDCUSTOMER
1001   A2      80   CUST001 
1001   A3      75   CUST001
1003   A12     35   CUST002