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Welcome to psql 8.3.7, the PostgreSQL interactive terminal.
 
Type: \copyright for distribution terms
\h for help with SQL commands
\? for help with psql commands
\g or terminate with semicolon to execute query
\q to quit
 
test_psql=> select null as data;
data
------
(1 row)
 
test_psql=> select null>10, null<10, null=null, 10=10 as data;
?column? | ?column? | ?column? | data
----------+----------+----------+------
| | | t
(1 row)
 
test_psql=>

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