按列计数

Question

我有以下数据：

我想知道每列中每个值的存在频率。所以我的优先输出应该是这样的：

如果有人能帮助我，我真的很感激。谢谢！

Answer 1

使用UNPIVOT然后PIVOT：

SQL Fiddle

Oracle 11g R2架构设置：

CREATE TABLE table_name ( a, b, c, d ) AS
SELECT 1, 2, 1, 2 FROM DUAL UNION ALL
SELECT 1, 2, 2, 2 FROM DUAL UNION ALL
SELECT 2, 1, 3, 3 FROM DUAL UNION ALL
SELECT 3, 3, 2, 4 FROM DUAL UNION ALL
SELECT 4, 4, 2, 5 FROM DUAL UNION ALL
SELECT 5, 5, 5, 5 FROM DUAL;

查询1 ：

SELECT *
FROM   table_name
UNPIVOT( value FOR name IN ( A, B, C, D ) )
PIVOT  ( COUNT(1) FOR name IN ( 'A' AS A, 'B' AS B, 'C' AS C, 'D' AS D ) )

<强> Results ：

| VALUE | A | B | C | D |
|-------|---|---|---|---|
|     1 | 2 | 1 | 1 | 0 |
|     2 | 1 | 2 | 3 | 2 |
|     4 | 1 | 1 | 0 | 1 |
|     5 | 1 | 1 | 1 | 2 |
|     3 | 1 | 1 | 1 | 1 |

Answer 2

with
     inputs ( a, b, c, d ) as (
       select 1, 2, 1, 2 from dual union all
       select 1, 2, 2, 2 from dual union all
       select 2, 1, 3, 3 from dual union all
       select 3, 3, 2, 4 from dual union all
       select 4, 4, 2, 5 from dual union all
       select 5, 5, 5, 5 from dual
     )
-- End of simulated inputs (for testing only, not part of the solution).
-- SQL query begins BELOW THIS LINE. Use your actual table and column names.
select grade,
       count(case when a = grade then 0 end) as a,
       count(case when b = grade then 0 end) as b,
       count(case when c = grade then 0 end) as c,
       count(case when d = grade then 0 end) as d
from   inputs cross join (select level as grade from dual connect by level <= 5)
group by grade
order by grade
;

     GRADE          A          B          C          D
---------- ---------- ---------- ---------- ----------
         1          2          1          1          0
         2          1          2          3          2
         3          1          1          1          1
         4          1          1          0          1
         5          1          1          1          2

注意：这与MT0的解决方案基本相同，但是无法解决和转动都采用了旧的方式＆＃34; （因为它们是在Oracle 11.1中引入PIVOT和UNPIVOT操作符之前完成的。）

Answer 3

这是一个奇怪的表结构和/或任务。您可能想要考虑数据库设计。无论如何...

var app = angular.module('app', [])
.controller('ctrl', function ($scope) {
    var data = {
        name: 'Name of Item',
        Description: '<div>Details: Here is Details</div><div>Type: Here is Type</div>'
    }

    $scope.data = data;
    $scope.result = $scope.data.Description.split('</div>');
    $scope.result = $scope.result[0].slice(0, -1); //take the first value from array, and slice last char, which is comma
    $scope.result = $scope.result + '</div>' //insert div at the end
})