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Closes #8 by adding examples of GROUP and UNION

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Simon Holywell 2017-02-27 09:55:03 +10:00
parent 9f1024dfab
commit 436bbf1337
1 changed files with 17 additions and 5 deletions
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@ -176,11 +176,23 @@ the readers eye to scan over the code and separate the keywords from the
implementation detail. Rivers are [bad in typography][rivers], but helpful here. implementation detail. Rivers are [bad in typography][rivers], but helpful here.
```sql ```sql
SELECT f.average_height, f.average_diameter (SELECT f.species_name,
AVG(f.height) AS average_height, AVG(f.diameter) AS average_diameter
FROM flora AS f FROM flora AS f
WHERE f.species_name = 'Banksia' WHERE f.species_name = 'Banksia'
OR f.species_name = 'Sheoak' OR f.species_name = 'Sheoak'
OR f.species_name = 'Wattle'; OR f.species_name = 'Wattle'
GROUP BY f.species_name, f.observation_date)
UNION ALL
(SELECT b.species_name,
AVG(b.height) AS average_height, AVG(b.diameter) AS average_diameter
FROM botanic_garden_flora AS b
WHERE b.species_name = 'Banksia'
OR b.species_name = 'Sheoak'
OR b.species_name = 'Wattle'
GROUP BY b.species_name, b.observation_date)
``` ```
Notice that `SELECT`, `FROM`, etc. are all right aligned while the actual column Notice that `SELECT`, `FROM`, etc. are all right aligned while the actual column