使用common_schema函數的mysql SELECT select_option返回NULL

Question

所以我試圖通過一個行的json encdoded值的總和來排序數據庫中的項目。例如幾排的樣子：

id | program_invested_details | program_add_status | program_status 

5 | {"invested":"120.00","received":5.4} | 4 | 1 
7 | {"invested":"120.00","received":9} | 4 | 1 
15 | {"invested":"110.00","received":50} | 4 | 1 
52 | {"invested":"110.00","received":2} | 4 | 1 

和我的查詢看起來像：

SELECT id, ((`common_schema`.`get_option`("program_invested_details", "received") * 100)/`common_schema`.`get_option`("program_invested_details", "invested")) AS PERCENT_TOTAL FROM `hp_programs_list` WHERE `program_add_status` = 4 AND `program_status` = 1 ORDER BY PERCENT_TOTAL DESC 

但此查詢結果後是不一樣的，因爲它應該是：

mysql> SELECT id, ((`common_schema`.`get_option`("program_invested_details", "received") * 100)/`common_schema`.`get_option`("program_invested_details", "invested")) AS PERCENT_TOTAL FROM `hp_programs_list` WHERE `program_add_status` = 4 AND `program_status` = 1 ORDER BY PERCENT_TOTAL DESC; 
+-----+---------------+ 
| id | PERCENT_TOTAL | 
+-----+---------------+ 
| 314 | NULL   | 
| 308 | NULL   | 
| 307 | NULL   | 
| 302 | NULL   | 
| 287 | NULL   | 
| 285 | NULL   | 
| 280 | NULL   | 
| 277 | NULL   | 
| 269 | NULL   | 
| 319 | NULL   | 
| 317 | NULL   | 
+-----+---------------+ 
11 rows in set (0.00 sec) 

所以PERCENT_TOTAL是NULL而不是SUM。哪裏有問題？

Answer 1

mysql> SELECT `common_schema`.`get_option`(`program_invested_details`, 'received') `percent` FROM `admin_hyips_database`.`hp_programs_list` ORDER BY percent DESC LIMIT 10; 
+---------+ 
| percent | 
+---------+ 
| 93.50 | 
| 92.13 | 
| 91.47 | 
| 9.90 | 
| 9.19 | 
| 9.14 | 
| 9.13 | 
| 9.02 | 
| 9.00 | 
| 9.00 | 
+---------+ 

其工作。刪除雙引號並在選擇器上添加「`」。