Add answers to 'merging data' exercises

[devbioinfoguy]

[devbioinfoguy]

select * from Survey order by quant, reading DESC

select * from Survey where quant=‘sal’ and (reading < 0 OR reading > 1.0);

select count(*) from Survey where read=‘sal’ and (quant < 0 AND quant > 1.0)

select personal, family, quant, reading from Person JOIN Survey WHERE Survey.person = Person.id