Question

我有一个包含150多个表的数据库（让我们称之为DB），（例如：table1，table2等）

问题

I want to loop through all tables and get count of rows by groups, as below

当前方法

As of now I was thinking of appending all tables or doing so manually!

表格结构

name code
A    code1
A    code2
A    code6
A    code98
B    code1

预期输出

table_name name code   count
table1     A    code1  100
table1     B    code2  941
table2     A    code1  98

每个表格的代码

SELECT name, code, count (*) AS count 
FROM table1
GROUP BY name, code

Answer 1

您可以使用SP ForEachTable来执行存储在数据库中的每个表的代码。尝试这样的事情：

sp_MSforeachtable @command1="select '?' AS TABLE_NAME,count(*) from ?"

Answer 2

如果你想要结果一个结果集，下面的结果将起作用：

CREATE TABLE #Temp
(
tableName VARCHAR(100)
,name VARCHAR(10)
,code VARCHAR(10)
, [Count] INT
)

EXEC sys.sp_MSforeachtable @command1=" insert into #Temp select '?' AS tableName,Name,Code,count(*) from ? group by Name, Code"

SELECT * FROM #Temp
DROP TABLE #temp

作为替代方案，使用动态sql：

CREATE TABLE #Temp
(
tableName VARCHAR(100)
,name VARCHAR(10)
,Code VARCHAR(10)
, [Count] INT
)

DECLARE @TableName VARCHAR(100)

DECLARE tableCursor CURSOR FAST_FORWARD FOR
SELECT name FROM sys.tables WHERE type ='U'

OPEN tableCursor
FETCH NEXT FROM tableCursor INTO @TableName


WHILE (@@FETCH_STATUS = 0)
BEGIN
DECLARE @Query NVARCHAR(MAX)= N'select @table as TableName, Name, Code,Count(*) as [Count] from  '+  @tablename + ' Group by Name, Code'
INSERT INTO #Temp
EXEC sp_executesql @Query,  N'@table varchar(100)', @table = @TableName
FETCH NEXT FROM tableCursor INTO @TableName

END
CLOSE tableCursor
DEALLOCATE tableCursor
SELECT * FROM #temp

DROP TABLE #temp

跨数据库中的所有表对Group进行查询

2 个答案: