shell script is not working when it is called using cron scheduler - linux

Question

I have this sh script
SPTH="/home/db_backup/log/log_"$(date +'%d-%m-%Y %H:%M')".txt"
echo "===DUMP started at $(date +'%d-%m-%Y %H:%M:%S')===" >> "$SPTH";
DBNAME="test"
PGPASSWORD=postgres psql -U postgres -d postgres -c "CREATE DATABASE $DBNAME";
PGPASSWORD=postgres psql -U postgres -d $DBNAME -c "ALTER SCHEMA public RENAME TO public_old";
for entry in /home/SQL/*.*
do
echo "$entry"
SUBSTRING=$(echo $entry| cut -d'/' -f 4)
#echo $SUBSTRING
SCHEMA=$(echo $SUBSTRING| cut -d'.' -f 1)
echo $SCHEMA
echo "===================== CREATING public SCHEMA =====================" >> "$SPTH";
PGPASSWORD=postgres psql -U postgres -d $DBNAME -c "Create Schema public";
echo "===================== RESTORING DATA OF $SCHEMA =====================" >> "$SPTH";
PGPASSWORD=postgres psql -U postgres -d $DBNAME -f "$entry";
echo "===================== DELETING SCHEMA $SCHEMA=====================" >> "$SPTH";
PGPASSWORD=postgres psql -U postgres -d $DBNAME -c "DROP SCHEMA $SCHEMA CASCADE";
echo "===================== RENAMING SCHEMA PUBLIC TO $SCHEMA=====================" >> "$SPTH";
PGPASSWORD=postgres psql -U postgres -d $DBNAME -c "ALTER SCHEMA public RENAME TO $SCHEMA";
echo "===================== RENAMING SQL FILE =====================" >> "$SPTH";
mv /home/SQL/{$SUBSTRING,DONE--$SUBSTRING};
echo "===================== DONE =====================" >> "$SPTH";
done
PGPASSWORD=postgres psql -U postgres -d $DBNAME -c "ALTER SCHEMA public_old RENAME TO public";
echo "===DUMP finished at $(date +'%d-%m-%Y %H:%M:%S')===" >> "$SPTH";
When I am running this command using command
sh script.sh
its working fine, working as I expected and running each and every command. But when I am running this script using cron scheduler commands related to POSTGRES is not executing. I also want log of every command I in this shell script.
I want to run this script using cron scheduler.
Where I am wrong?