Question

SELECT * FROM (SELECT ROW_NUMBER()
over
     (
        ORDER BY
          CASE WHEN @SortExpression ='Country_id' THEN Country_id END,
          CASE WHEN @SortExpression ='Country_name' THEN Country_name END,
          CASE WHEN @SortExpression ='Country_region' THEN Country_region END,
          CASE WHEN @SortExpression ='Country_area' THEN Country_area END,
          CASE WHEN @SortExpression ='Country_Population' THEN Country_Population END,
        CASE WHEN @SortExpression ='Country_gdp' THEN Country_gdp END
     )as num ,* From Country_Profile123 ) as tbl
      WHERE num BETWEEN @column AND @column1

我解决了问题的一半（即分页和排序），我现在要做的就是排序顺序。

Answer 1

使用单个case语句，而不是为每个可能的值重复相同的case语句：

SELECT * FROM (
  SELECT ROW_NUMBER()
  over (
    ORDER BY
      CASE @SortExpression
        WHEN 'Country_id' THEN Country_id
        WHEN 'Country_name' THEN Country_name
        WHEN 'Country_region' THEN Country_region
        WHEN 'Country_area' THEN Country_area
        WHEN 'Country_Population' THEN Country_Population
        WHEN 'Country_gdp' THEN Country_gdp
      END
  ) as num, * From Country_Profile123
) as tbl
WHERE num BETWEEN @column AND @column1

应用排序顺序有点棘手。您无法将方向应用于该值，因此您需要一个具有不同方向的第一手机箱和二手机箱：

SELECT * FROM (
  SELECT ROW_NUMBER()
  over (
    ORDER BY
      CASE @SortExpression
        WHEN 'Country_id' THEN Country_id
        WHEN 'Country_name' THEN Country_name
        WHEN 'Country_region' THEN Country_region
        WHEN 'Country_area' THEN Country_area
        WHEN 'Country_Population' THEN Country_Population
        WHEN 'Country_gdp' THEN Country_gdp
        ELSE 0
      END,
      CASE @SortExpression
        WHEN 'Country_id_desc' THEN Country_id
        WHEN 'Country_name_desc' THEN Country_name
        WHEN 'Country_region_desc' THEN Country_region
        WHEN 'Country_area_desc' THEN Country_area
        WHEN 'Country_Population_desc' THEN Country_Population
        WHEN 'Country_gdp_desc' THEN Country_gdp
        ELSE 0
      END DESC
  ) as num, * From Country_Profile123
) as tbl
WHERE num BETWEEN @column AND @column1

Answer 2

你在找这样的东西吗？

SELECT * FROM (SELECT ROW_NUMBER()
over
     (
        ORDER BY
          CASE WHEN @SortExpression ='Country_id' THEN Country_id DESC END,
          CASE WHEN @SortExpression ='Country_id_asc' THEN Country_id ASC END,
          CASE WHEN @SortExpression ='Country_name' THEN Country_name DESC END,
          CASE WHEN @SortExpression ='Country_name_asc' THEN Country_name ASC END,
          CASE WHEN @SortExpression ='Country_region' THEN Country_region DESC END,
          CASE WHEN @SortExpression ='Country_region_asc' THEN Country_region ASC END,
          CASE WHEN @SortExpression ='Country_area' THEN Country_area DESC END,
          CASE WHEN @SortExpression ='Country_area_asc' THEN Country_area ASC END,
          CASE WHEN @SortExpression ='Country_Population' THEN Country_Population DESC  END,
          CASE WHEN @SortExpression ='Country_Population_asc' THEN Country_Population ASC END,
        CASE WHEN @SortExpression ='Country_gdp' THEN Country_gdp DESC END
        CASE WHEN @SortExpression ='Country_gdp_asc' THEN Country_gdp ASC END
     )as num ,* From Country_Profile123 ) as tbl
      WHERE num BETWEEN @column AND @column1

将查询设置为asc或desc顺序？

2 个答案: