怎么查询SQL语数据条数？

Posted 2023-05-06

参考技术A

步骤如下：

1. select count(*) from table; //统计元组个数

2. select count(列名) from table; //统计一列中值的个数

3. select count(*) from table where 字段 = ""; //符合该条件的记录总数

4. sql_count = "select count(*) from article a where 1=1 ";

//这条语句中a就代表article 这张表，后面可以写a.字段来代表该表的字段，where 1 = 1，就相当于提供了一个where。因为1=1永远成立。

就可以根据是否需要加条件，在该语句后面加and a.字段 = "", 等等。

例：

1 sql_count = "select count(*) from article a where 1=1 ";

2 if(!"".equals(title) && title!=null)

3 sql_count +="and a.a_title like '%"+title+"%'";

4  

sql server查询数据库总数据条数

1：

select  

        sum(c.row_count) as datacount  
from    sys.indexes a ,  
        sys.objects b ,  
        sys.dm_db_partition_stats c  
where   a.[object_id] = b.[object_id]  
        AND b.[object_id] = c.[object_id]  
        AND a.index_id = c.index_id  
        AND a.index_id < 2  

        AND b.is_ms_shipped = 0 

 

2：

select  b.name as tablename ,  
        a.rowcnt as datacount  
from    sysindexes a ,  
        sysobjects b  
where   a.id = b.id  
        and a.indid < 2  
        and objectproperty(b.id, ‘IsMSShipped‘) = 0