Oracle查詢數據庫中所有表的記錄數
阿新 • • 發佈:2017-05-10
ner dia function sta dbms repl log found tab 方法一:
首先建立一個計算函數
1 create or replace function count_rows(table_name in varchar2, 2 owner in varchar2 default null) 3 return number 4 authid current_user 5 IS 6 num_rows number; 7 stmt varchar2(2000); 8 begin 9 if owner is null then 10 stmt := ‘select count(*) from "然後通過計算函數進行統計‘||table_name||‘"‘; 11 else 12 stmt := ‘select count(*) from "‘||owner||‘"."‘||table_name||‘"‘; 13 end if; 14 execute immediate stmt into num_rows; 15 return num_rows; 16 end;
select table_name, count_rows(table_name) nrows from user_tables
獲取要統計的值
方法二:1 select t.table_name,t.num_rows from查看記錄數,但是num_rows存儲的是上次分析後的值,不準確,要使用該方法,必須分析後才可以試用 完成的語句為user_tables t
1 declare 2 v_tName varchar(50); 3 v_sqlanalyze varchar(500); 4 v_num number; 5 v_sql varchar(500); 6 cursor c1 7 is 8 select table_name from user_tables; 9 begin 10 open c1; 11 loop 12 fetch c1 into v_tName; 13 if c1%found then14 v_sqlanalyze :=‘analyze table ‘||v_tName||‘ estimate statistics‘; 15 execute immediate v_sqlanalyze; 16 v_sql := ‘select NUM_ROWS from user_tables where table_name =upper(‘‘‘||v_tName||‘‘‘)‘; 17 execute immediate v_sql into v_num; 18 dbms_output.put_line(‘表名: ‘||v_tName||‘ 行數: ‘||v_num); 19 else 20 exit; 21 end if; 22 end loop; 23 end;
Oracle查詢數據庫中所有表的記錄數