如何在6列中找到最大值

Question

我有一张这样的桌子。

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

我想返回每行中术语的最大值。

像这样：

SELECT studentCode, maxterm FROM my_tbl

如何用我的最大值填充maxterm 感谢...

Answer 1

尝试：

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

Source

Answer 2

使用GREATEST()

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

Answer 3

只有几列，你可以使用if子句。

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

Answer 4

尝试使用GREATEST：

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