Inline if-then-else in MySQL queries
It can be useful to have a Ruby expression like condition ? positive_case : negative_case
in MySQL queries:
UPDATE users SET monthly_debit = IF(subscriber, 19, 0)
Related cards:
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MySQL will not use indexes if you query the wrong data type
When MySQL refuses to use your index, you can do a number of things wrong. One of them might be conditions with improper data types.
An example
For example, let's assume you have a users
table with an email
field (varchar
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MySQL: How to create columns like "bigint" or "longtext" in Rails migrations, and what :limit means for column migrations
Rails understands a :limit
options when you create columns in a migration. Its meaning depends on the column type, and sometimes the supplied value.
[The documentation](http://apidock.com/rails/ActiveRecord/ConnectionAdapters/TableDefinition/co...