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[英]How to get COUNT for same table in different databases with table name in SELECT statement?
[英]How to get the result set from the Select statement from different databases having same table structure using cursor
下面是一段代码,需要从不同数据库的同一条select语句中获取结果。 我已经使用光标从MASTER.dbo.sysdatabases中选择数据库列表,并将其传递给变量(即@name),该变量将一个接一个地保存数据库名称。
在选择语句下,我已经传递了类似@ name.dbo.currencyconversionrates
但是,在运行代码时,我没有得到结果。 错误信息:-
消息102,级别15,状态1,第23行在“。”附近的语法不正确。
我的代码:
DECLARE @name nVARCHAR(100)
DECLARE @DBV nVARCHAR(100)
DECLARE @db_cursor CURSOR
SET @db_cursor = CURSOR FAST_FORWARD
FOR
SELECT name
FROM MASTER.dbo.sysdatabases
WHERE name IN ('ENT_Benteler','ENT_DEUTSCHE_BANK','ELV_Henry_Schein','ENT_HONDA')
OPEN @db_cursor
FETCH NEXT FROM @db_cursor INTO @name
WHILE @@FETCH_STATUS = 0
BEGIN
set @DBV= @name
FETCH NEXT FROM @db_cursor INTO @name
--print @DBV
--use @name
select row_id, base_currency,conversion_currency, effective_period_start, effective_period_end, rate, effective_period_start as 'Use this for Script' from @name.dbo.currencyconversionrates
order by CONVERSION_CURRENCY,EFFECTIVE_PERIOD_START
END
CLOSE @db_cursor
DEALLOCATE @db_cursor
请帮助我纠正问题。
select row_id, base_currency,conversion_currency, effective_period_start, effective_period_end, rate, effective_period_start as 'Use this for Script'
from @name.dbo.currencyconversionrates
order by CONVERSION_CURRENCY,EFFECTIVE_PERIOD_START
上面的部分不正确,因为不支持from
之后的参数。 您应该利用dynamic SQL
,忽略SQL injection
,您可以这样做:
DECLARE @SQL VARCHAR(MAX)
SET @SQL = '
select row_id, base_currency,conversion_currency, effective_period_start, effective_period_end, rate, effective_period_start as [Use this for Script]
from ['+ @name +'].dbo.currencyconversionrates
order by CONVERSION_CURRENCY,EFFECTIVE_PERIOD_START'
print (@SQL)
--EXEC (@SQL)
在EXEC
发表评论之前先尝试print
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