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SELECT * from INFORMATION_SCHEMA.Tables
WHERE TABLE_TYPE = 'BASE TABLE'
AND OBJECTPROP ......
Subquery: (single-row subqueries and multi-rows subqueries).
select select_list
from table
where expr operator (select select_list from table);
single-row subqueries operator: =, >, >=, <, <=, <>
e.g.:
1. select department_id, min(salary) from employees group by department_id ......
oracle tips
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select gw.ndocid from
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where
not exists (select null from wf_doc_gw_sn sn where sn.ndocid=gw.ndocid)
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select gw.ndocid from
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