http://www.inoracle.com/blog/best-way-to-create-data-types-in-oracle/
In Oracle, each ‘column value’ & constant in SQL expression has a ‘data type’, which is related with a distinct storage format, constraints, & well founded range of values.
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4.
5. BEST WAY TO CREATE DATA TYPES IN ORACLE
In Oracle, each ‘column value’
& constant in SQL expression has a ‘data
type’, which is related with a distinct
storage format, constraints, & well
founded range of values.