Web Reference: When you create a table or cluster, you must specify a data type for each of its columns. When you create a procedure or stored function, you must specify a data type for each of its arguments. These data types define the domain of values that each column can contain or each argument can have. Jan 28, 2026 · In this guide, we’ll walk through 26 essential Oracle data types you’ll actually use, explain when to choose each, and show how to avoid the common pitfalls that cost teams time and money. In Oracle, every value has a data type that defines a set of characteristics for the value. These characteristics cause Oracle to treat the values of one data type differently from the values of another. For example, you can add values of the NUMBERdata type, but not values of the RAW data type. When creating a new table, you specify a data type fo...
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