sql server 2008 - SQL Query Help Part 2 - Add filter to joined tables and get max value from filter -

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I asked questions on SO, however, I wish to extend it. I would like to get the maximum value of the 'reading' column only in the place where the 'state' value is an example of 'XX'.

So if I join two tables, then how do I compare the line results with the maximum (reading) value. E.g. 

  SELECT s *, G1. * As a grade of pair from school, G1 on G. 1. ID-school = s.id WHERE s.state = 'SA' // How do I get this result set from the line with the maximum reading (

The details of the table are: 

  Table 1 = School column: ID (PK), state (nvchar (100)), school name table 2 = grade column: ID (PK), ID_school (FK), year, reading, writing ...  
 
 I want to use a normal table expression I will think in RE: Institution with schools (ID, State, School Name) AS (SELECT id, state, schoolname, WHERE state = 'XX' from schools) = G.ID_Schools in schools Select the school from the institutions as the grade of. G. Reading = Maximum (G. Readings)

The good thing about this is that it makes these schools a pseudo table that wraps all the arguments about the state's filtering, by which You can write your remaining questions without thinking about it.


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