Oracle查询数据库中所有表的记录数

Posted 2020-09-17

方法一：

首先建立一个计算函数

 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 "‘||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;

然后通过计算函数进行统计

select table_name, count_rows(table_name) nrows from user_tables

获取要统计的值

方法二：

1 select t.table_name,t.num_rows from user_tables t 

查看记录数，但是num_rows存储的是上次分析后的值，不准确，要使用该方法，必须分析后才可以试用

完成的语句为

 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 then
14 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||‘ 行数： ‘||v_num);
19 else
20 exit;
21 end if;
22 end loop;
23 end;