There are many a time when we need to get the aggregate or maximum function but 4GL Language do not offers a syntax for the same.
But we definitely have an option to use SQL queries in 4GL and this does the most of the job for us.
Just go through the statements mentioned below:
Local char REQSTR(250)(10)
For [Table name] where document no
REQSTR(0) = “SQL query ”
For fields_0 from Databasetyp Sql REQSTR(0…10) as tablename
Databasetyp: it is a database type for this we have create function so it will identify that current database uses by X3 server
We have applied this with example.
Local Char REQSTR(250)(10)
For [Z3T] Where 1=1
For [ZQRY] Where DOCNO = [F:Z3T]DOCNO
REQSTR(0) = “SELECT DOCDATE_0, QRNO_0 FROM ZETIQUERY WHERE ROWID =”+num$([F:ZQRY] ROWID)+””
For (Date DOCDATE, Char QRNO) From func GETDBTYP Sql REQSTR(0..10) As [ZYOP]
Update [Z3T] Where DOCNO = [ZQRY]DOCNO With DOCDATE = [F:ZYOP]DOCDATE
Update [Z3T] Where DOCNO = [ZQRY]DOCNO With QRNO = [F:ZYOP]QRNO
Update [Z3T] Where DOCNO = [ZQRY]DOCNO With MARK = 2
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