comment trouver le nombre de lignes dans une table lorsque le nom de la table est dans une variable?

Question

ci-dessous ne fonctionne pas :(

Select @CurrentTableName = TableName from @tempTableNames Where ID = @ID 
Select @NumberOfColumns = SELECT count(*) FROM information_schema.columns WHERE table_name = @CurrentTableName 
Select @SqlStmt = 'SELECT count(*) FROM ' + @CurrentTableName 
Select @NumberOfRwos = exec @SqlStmt 

Answer 1

Declare @Count int 
Declare @Sql nvarchar(4000) 
Set @Sql = 'Select @Count = Count(*) From ' + Quotename(@CurrentTableName) 

exec sp_executesql @SQL, N'@Count int OUTPUT', @Count OUTPUT 

Select @Count...