如何在6列中找到最大值

Question

我有一張這樣的表格。

+-------------+-------+-------+-------+-------+-------+ 
| studentCode | term1 | term2 | term3 | term4 | term6 | 
+-------------+-------+-------+-------+-------+-------+ 

我想返回每行中術語的最大值。

這樣的：

SELECT studentCode, maxterm FROM my_tbl 

我怎麼能填滿我最大值最大項。
謝謝...

Answer 1

嘗試：

SELECT studentCode, GREATEST(term1, term2, term3, term4, ...) FROM my_tbl 

Source

Answer 2

只有幾列，你可以使用if子句。

SELECT IF(`col_1` > `col_2`, `col_1`, `col_2`) AS max FROM `my_table` 

Answer 3

使用GREATEST()

select studentCode, 
     greatest(term1, term2, term3, term4, term5, term6) 
from my_tbl; 

Answer 4

嘗試使用GREATEST：

SELECT studentCode, GREATEST(term1, term2, term3, term4, term5, term6) 
FROM my_tbl