的Oracle SQL來解決，在這個SELECT語句獲取多個值

Question

select * 
from (
    select table_name 
    from user_tab_cols 
    where column_name='CONTRACT_NUMBER' 
) 
where contarct_number ='U5490231' 

列清單與select語句的SQL查詢，我試圖讓表的從user_tab_cols
列表，然後做一個

select * 
from table_name 
where column_name='U5490231'. 

試圖找到在此基礎上SELECT語句，但得到錯誤

Answer 1

Oracle Query: 
v_table NVARCHAR(MAX) 
v_whereCol NVARCHAR(MAX) 
v_WhereParam NVARCHAR(MAX) 

v_WhereParam := 'CONTRACT_NUMBER' 
v_whereCol := 'U5490231' 

SELECT E.table_name INTO v_table 
FROM user_tab_cols AS E 
WHERE E.column_name = v_WhereParam 
v_query NVARCHAR(MAX) 
v_query := 'Select * from ' || v_table || ' Where contarct_number =''' || v_whereCol || '''' 
EXECUTE IMMEDIATE v_query