Does Oracle's Number Data Type Preserve Trailing Zeros?

Does Oracle Preserve Trailing Zeroes in Number Data Types?

In Oracle, the Number data type is designed to handle numeric values with varying precision and scale. However, users may encounter scenarios where trailing zeroes are not displayed when querying numeric values.

To illustrate this issue, consider the following example:

When querying this table in SQL Developer, the results appear as follows:

As you can observe, the trailing zeroes in the numerical values are not displayed. This behavior may cause confusion when comparing BigDecimal values in Java code, as the scale of the numbers may change after being saved to the database.

Understanding the Issue

The absence of trailing zeroes in the output is not a data storage issue but rather a display issue. Oracle internally stores numeric values in a format that does not require the preservation of trailing zeroes. This is because trailing zeroes are not considered significant.

Handling Trailing Zeroes

While Oracle does not natively store trailing zeroes, there are several options to handle this issue:

Display Formatting:

If you require trailing zeroes for display purposes, you can use formatting techniques when converting the values to a string. For instance, the following Java code will display the number with four decimal places:

Scale Control:

If the issue is related to scale differences when comparing BigDecimal values, you can explicitly set the scale to the desired value before making the comparison. This will ensure that the values are compared correctly.

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