SET CONNECTION — select a database connection
SET CONNECTION [ TO | = ] connection_name
SET CONNECTION
sets the “current” database connection, which is the one that all commands use unless overridden.
connection_name
A database connection name established by the CONNECT
command.
CURRENT
Set the connection to the current connection (thus, nothing happens).
EXEC SQL SET CONNECTION TO con2; EXEC SQL SET CONNECTION = con1;
SET CONNECTION
is specified in the SQL standard.