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Undefine [SQL*Plus] | ||
undefines a variable in SQL*Plus that was previously defined with define.
... yet to be finished ...
set feedback off create table t ( name varchar2(10), num number, dept varchar2(10) ); insert into t values ('John', 1, 'acc'); insert into t values ('Iain', 2, 'acc'); insert into t values ('Marc', 3, 'sal'); insert into t values ('Bob' , 4, 'it' ); undefine dept select * from t where dept = case when length('&&dept') > 0 then '&dept' else dept end; drop table t; |