There are 5 different integer columns, each hold integer values of different sizes.
Moreover, each can be signed or unsigned. If your value can’t ever be negative (for example, for an index), then you should probably make your values unsigned.

DROP TABLE `foo`.`example_03`;
CREATE TABLE IF NOT EXISTS `foo`.`example_03` (
f_01 TINYINT, [...]

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This example shows how to set default values for each column — as well as how to allow (or not allow) NULL values in the column. By default, any column can contain NULL values.
(Note that we’re also using “CREATE TABLE IF NOT EXISTS” so an error doesn’t get thrown if the table already exists when [...]

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Here’s a basic example of a MySQL CREATE TABLE command.

CREATE TABLE `foo`.`example_01` (
`field_1` VARCHAR(255),
`field_2` CHAR(10),
`field_3` INT(10),
`field_4` BIGINT(20),
`field_5` [...]

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Sometimes when using Active Record you may want to create a database connection to a database other than the default database specified in your database.yml file.
When this happens, the easiest way to do it is to use the Class-level convenience method on ActiveRecord::Base. Like this:
Imagine your database.yml entry looks like this:
development_foo:
adapter: [...]

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What is a cursor and when should you use one?
A ‘cursor’ in MySQL is essentially just the result set that’s returned from a query. Using a cursor allows you to iterate, or step through, the results of a query and perform certain operations on each row that’s returned.
Think of them like holders [...]

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