https://www.ibm.com/docs/en/db2/12.1.x?topic=types-supported-sql-data-in-cobol
Supported SQL data types in COBOL embedded SQL applications
Certain predefined COBOL data types correspond to Db2 database column types. You can use only these COBOL data types as host variables.
data types in cobolsupportedsqlembeddedapplications