GROUP_CONCAT 在不同的列中拆分 MYSQL

Question

我正在使用 TABLE，需要邏輯幫助此查詢：

SELECT DATE_FORMAT(tran_date, '%M %Y') AS month_name, 
       SUM(IF(c.ctype = 4, gl.amount * -1, 0)) AS sales,
       GROUP_CONCAT(DISTINCT(d.name)) AS d_name
FROM gl_trans AS gl, company_chart_masters AS a, 
     company_chart_types AS t, company_chart_classes AS c, dimensions as d   
WHERE (c.ctype = 4 OR c.ctype = 5) AND
      d.id = gl.dimension2_id AND
      gl.account = a.account_code AND
      a.account_type = t.id AND
      t.class_id = c.id AND
      DIMENSION2_id = gl.dimension2_id
GROUP BY month_name
ORDER BY month_name DESC

產生這個結果：

如您所見，查詢的 output 有 3 個 coloum month_name sale和pos的 pos 列用逗號分隔但我現在想要將 pos 拆分為不同的列（因子 matab，Rawalpindi matab，...）。

我的第二個問題是，我還拆分了銷售列，就像拆分pos列一樣，並相應地顯示銷售，並且這個銷售列在拆分后也顯示在不同的列中。

有沒有其他方法可以拆分結果並顯示列和同一行中的每個值？ 在同樣的結果？

預期結果：

**Month_name**,          **Factor_Matab**,          **Rawalpindi_Matab** 
feb 2020,                  25000,                     78236
mar 2020,                  26366,                     82367

由於我是堆棧溢出的新手，所以我不知道如何以表格形式顯示此預期結果

Answer 1

為了獲得您的期望，您應該使用pivot table模式：

SELECT 
    month_name,
    -- pivot table
    SUM(IF(dimension = 'Factor_Matab', sales, 0)) AS Factor_Matab,
    SUM(IF(dimension = 'Rawalpindi_Matab', sales, 0)) AS Rawalpindi_Matab
FROM (
    -- Select data grouped by month and dimension as tmp
    SELECT 
        DATE_FORMAT(tran_date, '%M %Y') AS month_name, 
        d.name AS dimension,
        SUM(IF(c.ctype = 4, gl.amount * -1, 0)) AS sales
    FROM 
        gl_trans AS gl, 
        company_chart_masters AS a, 
        company_chart_types AS t, 
        company_chart_classes AS c, 
        dimensions as d   
    WHERE (c.ctype = 4 OR c.ctype = 5) AND
        d.id = gl.dimension2_id AND
        gl.account = a.account_code AND
        a.account_type = t.id AND
        t.class_id = c.id AND
        DIMENSION2_id = gl.dimension2_id
    GROUP BY month_name, d.name
) tmp
-- group tmp table by month
GROUP BY month_name 
ORDER BY month_name DESC;