SQL Server 查询：关键字“组”附近的语法不正确

Question

I have two tables TableA and TableB . They have a join on TableA.refID = TableB.SomeID , then some other columns ( TableA.time , TableB.kind ).

I would like make a query, order by time a and group them by type.

This is the query I use (modified for a best showcase)

SELECT  
   *, TableA.time AS B, TableB.type AS A
FROM       
   TableB  
INNER JOIN
   TableB ON TableB.SomeID = TableA.refID
ORDER BY 
   B
GROUP BY 
   TableB.type

I get this exception:

Incorrect syntax near the keyword 'Group'.

How should I correct it?

Answer 1

ORDER BY comes after GROUP BY :

SELECT  *, TableA.time AS B, TableB.type AS A
FROM       TableB INNER JOIN
                  TableB ON TableB.SomeID = TableA.refID
GROUP BY TableB.type
ORDER BY B

The correct syntax is:

SELECT..
FROM...
WHERE...
GROUP BY..
ORDER BY..

Answer 2

Three things wrong with your query:

1. You have a group by after an order by. You can't order and then group you order grouped results

2. You're selecting * and grouping, that won't work.

3. You're grouping on TableB.type but TableA.time is not an aggregate so it either needs to be part of a group or an aggregate.

Here is an example of what your procedure should look like:

SELECT  
    TableA.time AS B, TableB.type AS A
FROM
    TableB 
INNER JOIN
    TableB ON TableB.SomeID = TableA.refID
GROUP BY 
    TableB.type, TableA.time
ORDER BY 
    TableA.time

OR

SELECT  Max(TableA.time) AS B, TableB.type AS A
FROM       TableB INNER JOIN
                  TableB ON TableB.SomeID = TableA.refID

GROUP BY TableB.type
ORDER BY Max(TableA.time)