Description

schema-name
Identifies a schema. No validation that the schema exists is made at the time the PATH is set. For example, if a schema-name is misspelled, it could affect the way subsequent SQL operates. Although not recommended, PATH can be specified as a schema-name if it is specified as a delimited identifier.
SYSTEM PATH
This value is the same as specifying the schema names "QSYS","QSYS2".
SESSION_USER or USER
This value is the SESSION_USER special register.
SYSTEM_USER
This value is the SYSTEM_USER special register.
CURRENT PATH
Specifies the value of the CURRENT PATH special register before the execution of this statement. CURRENT PATH is not allowed if the current path is *LIBL.
variable
Specifies a variable that contains one or more schema names that are separated by commas.

The variable:

string-constant
A character constant with one or more schema names that are separated by commas.