How to concatenate fields in oracle?

@samara 

In Oracle, you can concatenate fields using the || operator. You can use this operator to concatenate columns in a select statement like this:

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SELECT column1 || column2 as concatenated_columns
FROM your_table;

You can also concatenate strings with column values like this:

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SELECT 'This is column1: ' || column1 as concatenated_string
FROM your_table;

You can also concatenate multiple columns by chaining || operators like this:

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SELECT column1 || ', ' || column2 || ', ' || column3 as concatenated_columns
FROM your_table;

Make sure to use proper data type conversion if needed to avoid any errors during concatenation.