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SQL>select 'yakub' pasha from dual;
(what is the output and how it happen)
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Answer Posted / venu
it will return pasha as the column heading & yakub as the
record row selected.
dual is a single row dummy table.
it phisically not exist in database,
but work as a single row temp table to get instant result
witout any table,which is several times very usefull to
test result on single row.
ex: cheking the functions on single row before goint to
impliment on tables
sql> select upper(hai) from dual
/
sql>select sysdate from dual
/
etc
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