Question

我在sql server 2008中有一个表，其中列'TableName'表示特定表的名称。

TableName
----------
Person
Good
Organization

我想遍历此表并计算每个表的行数。

Answer 1

这将为您提供所有表的表名和行数。

方法1：使用系统表 - 提供近似行数

SELECT p.object_id, t.name, sum(p.rows) from sys.partitions p 
inner join sys.tables t on p.object_id = t.object_id 
group by p.object_id, t.name
order by 1

如果您正在管理自己的表

SELECT p.object_id, t.name, sum(p.rows) from sys.partitions p 
inner join sys.tables t on p.object_id = t.object_id 
inner join TableName u on u.TableName = t.name
group by p.object_id, t.name
order by 1

方法2：使用游标 - 精确行数

declare @tbl table(table_name varchar(100), rows bigint)
declare @tblName varchar(100) = ''
DECLARE @cur CURSOR
SET @cur = CURSOR FAST_FORWARD
   FOR 
            SELECT TableName FROM YourTable
OPEN @cur

FETCH NEXT FROM @cur
INTO @tblName

WHILE @@FETCH_STATUS = 0
BEGIN
  declare @query nvarchar(2000) --Passing parameter into dynamic query
  declare @out bigint =0 --Passing out parameter into dynamic query
  set @query = N'select @out = count(*) from ' + @tblName
  EXECUTE sp_executesql @query, N'@tblName varchar(100), @out bigint output'
  , @tblName = @tblName, @out = @out OUTPUT;

  INSERT into @tbl (table_name, rows) VALUES(@tblName, @out)

    FETCH NEXT FROM @cur
    INTO @tblName
END
CLOSE @cur
DEALLOCATE @cur

select * from @tbl

Answer 2

如果我假设您有一个包含数据库表名的表，则可以查询为。

Select count(*) from (select tablename from tablenames);

从表名列表中选择

2 个答案: