从表中选择最大计数并更新另一列

Question

I need to find the max value base on Count from column col1_class and update table2 column 'lbl1' with the value I tried this code but i gets error:

update testClassLable
set lbl1 = (
    select max(maxVal)
    from (
        select count (col1_class) as maxVal
        from tbl_test_all
        group by col1_class
    )x
)

can you help please?

* UPDATE *

I edited the code above and its work now but it return :

0 row(s) affected !

Answer 1

try this

update testClassLable
set lbl1 = (
    select max(countVal)
    from (
        select count(col1_class) as countVal
        from tbl_test_all
        group by col1_class
    ) x
)