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Simon Holywell 2015-07-12 22:53:17 +01:00
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@ -102,9 +102,9 @@ SELECT first_name
### Aliasing or correlations ### Aliasing or correlations
* Should relate in some way to the object or expression they are aliasing. * Should relate in some way to the object or expression they are aliasing.
* As rule of thumb the correlation name should be the first letter of each word * As a rule of thumb the correlation name should be the first letter of each word
in the object's name. in the object's name.
* If there is already a correlation with same name then append a number. * If there is already a correlation with the same name then append a number.
* Always include the `AS` keyword—makes it easier to read as it is explicit. * Always include the `AS` keyword—makes it easier to read as it is explicit.
* For computed data (`SUM()` or `AVG()`) use the name you would give it were it * For computed data (`SUM()` or `AVG()`) use the name you would give it were it
a column defined in the schema. a column defined in the schema.
@ -371,7 +371,7 @@ constraints along with field value validation.
* Use alphabetical order where `ON DELETE` comes before `ON UPDATE`. * Use alphabetical order where `ON DELETE` comes before `ON UPDATE`.
* If it make senses to do so align each aspect of the query on the same character * If it make senses to do so align each aspect of the query on the same character
position. For example all `NOT NULL` definitions could start at the same position. For example all `NOT NULL` definitions could start at the same
character position. This is not hard and fat, but it certainly makes the code character position. This is not hard and fast, but it certainly makes the code
much easier to scan and read. much easier to scan and read.
##### Validation ##### Validation