动态选择 where 条件中的列

Question

I am new to dynamic SQL programming. There are a set of tables with different schema (rows and values) whose record count is being taken dynamically through a loop. However, the records which are soft deleted shouldn't be a part of record count. Each of the table has a column which signifies a soft delete in Table_Name_IS_DELETED, for instance TB1_IS_DELETED. Please help me in dynamically updating the column name in the where condition.

The code I have written for counts

SET @Query = 'SELECT @K  = COUNT(*) FROM ['+@DB_Source+'].['+@Table_Schema+'].['+@Table_Name+'] x WITH (NOLOCK)

    EXEC sp_executesql @Query, N'@K INT OUTPUT', @K=@K OUTPUT;

Now there should be a WHERE condition in the dynamic query which should be like "TB1_IS_DELETED = 1" and the table name (TB1) should be updated accordingly.

Thanks for your help. :)

Answer 1

Like this:

SET @Query = '
SELECT @K = COUNT(*) 
FROM '+quotename(@DB_Source)+'.'+quotename(@Table_Schema)+'.'+quotename(@Table_Name)+' x WITH (NOLOCK)
where '+quotename(@Column_Name)+'=1
' 

EXEC sp_executesql @Query, N'@K INT OUTPUT', @K=@K OUTPUT;