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To return a table from the function, you use RETURNS TABLE syntax and specify the columns of the table. Each column is separated by a comma (, ). In the function, we return a query that is a result of a SELECT statement.
psql returns 0 to the shell if it finished normally, 1 if a fatal error of its own occurs (e.g., out of memory, file not found), 2 if the connection to the server went bad and the session was not interactive, and 3 if an error occurred in a script and the variable ON_ERROR_STOP was set.
In PostgreSQL, the dollar-quoted string constants ($$) is used in user-defined functions and stored procedures. In PostgreSQL, you use single quotes for a string constant like this: select 'String constant'; When a string constant contains a single quote ('), you need to escape it by doubling up the single quote.
You can capture the result of a command using the VAR=$(command) syntax:
VALUE=$(psql -qtAX -d database_name -f get_seq.sql)
echo $VALUE
The required psql options mean:
-t only tuple
-A output not unaligned
-q quiet
-X Don't run .psqlrc file
Try:
LAST_VALUE=`echo "SELECT last_value FROM my_seq;" | psql -qAt -d database_bame`
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