SQL/MX 3.2 Reference Manual (H06.25+, J06.14+)

Embedded-Only SQL/MX Statements
HP NonStop SQL/MX Release 3.2 Reference Manual—691117-001
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COBOL Examples of DECLARE MPLOC
COBOL Examples of DECLARE MPLOC

Set the default volume and subvolume:
EXEC SQL DECLARE MPLOC '$MYVOL.MYSUBVOL' END-EXEC.