Where to Specify Data Types - Firebird

A data type is defined for data items in the following situations:

  • Specifying column definitions in a CREATE TABLE specification
  • Creating a reusable global column template using CREATE DOMAIN
  • Modifying a global column template using ALTER DOMAIN
  • Adding a new column to a table or altering a column using ALTER TABLE
  • Declaring arguments and local variables in stored procedures and triggers
  • Declaring arguments and return values for external (user-defined) functions

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