[SQL] how to turn off autocommit in psql

[Kemin Zhou]

I search far and wide and found a lot of disscussions about the 
autocommit, but none about how to do it. 
After reading 50 pages, my brain is numb.  Could any one give me a 
simple help?
Thanks

Kemin



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TIP 9: the planner will ignore your desire to choose an index scan if your
     joining column's datatypes do not match