When a column is created or altered, a column type can be given. One of the column types is 'type'. 'type' can be any one of the following.

Name	Description
'string'	Contains one line of text, which can contain anything
'text'	Multiple lines of text, which can contain anything
'int'	An integer ranging within the limit provided by the user
'bool'	A boolean TRUE or FALSE
'enum'	A list of possible values a field can have. An 'enum' column must be provided with 'enum_values', which is an array in the format of array([$possibleValue]...). The default value is always the trailing value. If the value doesn't match any one of the enum_val's, then it will be replaced with the default value.
'date'	A 10 digit integer representing the UNIX timestamp of when the record was created

Note- The default data type is 'string'