SQL help, how to group by column A and then get top frequency of column B?

Assuming the following table, operation represents each kind of transaction operation
table operation employee other column c
'<' id1
'<' id1
'<' id2
'*' id3
'/' id1
question, for each operation, which employee do the most? which employee do the 2nd most?
I thought I need to group by operation first, and then get the frequency of employee, and get the top 1 or top 2 frequency highest.
But I am stuct, and do not know how to write the sql.

998408 wrote:
Assuming the following table, operation represents each kind of transaction operation
table operation employee other column c
'<' id1
'<' id1
'<' id2
'*' id3
'/' id1
question, for each operation, which employee do the most? which employee do the 2nd most?
I thought I need to group by operation first, and then get the frequency of employee, and get the top 1 or top 2 frequency highest.
But I am stuct, and do not know how to write the sql.Welcome to OTN. Ops! posted in wrong forum. Just post in {forum:id=75}. Before posting there close this thread marking as answered.
If someone's response is helpful or correct, please mark it accordingly.*

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SQL help, how to group by column A and then get top frequency of column B?

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