How to Fetch Only Uppercase Values In Oracle?

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To fetch only uppercase values in Oracle, you can use the UPPER function in your SQL query. The UPPER function converts a string to uppercase, so you can compare the original value with its uppercase version to filter out only the uppercase values. For example, you can use a WHERE clause like this:


SELECT column_name FROM table_name WHERE column_name = UPPER(column_name);


This query will return only the rows where the column value is in uppercase. You can adjust the column_name and table_name according to your specific case.

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What is the limitation of using the UPPER function in fetching uppercase values?

The limitation of using the UPPER function is that it affects the entire string, not just specific characters. This means that if there are any existing uppercase characters in the string, they will also be converted to uppercase. This can be a limitation if you only want to convert specific characters to uppercase while keeping others as they are.


How to fetch uppercase values from multiple columns in a single query in Oracle?

To fetch uppercase values from multiple columns in a single query in Oracle, you can use the UPPER() function in combination with the SELECT statement. Here's an example query:

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SELECT UPPER(column1) AS uppercase_column1,
       UPPER(column2) AS uppercase_column2,
       UPPER(column3) AS uppercase_column3
FROM your_table_name;


In this query:

  1. Replace column1, column2, and column3 with the names of the columns from which you want to fetch uppercase values.
  2. Replace your_table_name with the name of the table from which you want to fetch the data.


This query will retrieve the uppercase values from the specified columns in the table. You can add more columns to the SELECT statement as needed.


How to handle multi-byte characters while fetching uppercase values in Oracle?

To handle multi-byte characters while fetching uppercase values in Oracle, you can use the UPPER function along with the NLS_UPPER parameter to ensure that the conversion is done correctly for multi-byte characters.


Here is an example of how you can fetch uppercase values for multi-byte characters in Oracle:

  1. Use the NLS_UPPER function along with the NLS_SORT parameter to specify the sort sequence for the multi-byte characters. For example, if you are dealing with UTF-8 characters, you can set the NLS_SORT parameter to BINARY_CI to perform a case-insensitive binary sort.
  2. Use the UPPER function to convert the values to uppercase. Make sure to pass the NLS_UPPER parameter along with the value to ensure that the conversion is done correctly for multi-byte characters.


Here is an example query that demonstrates how to fetch uppercase values for multi-byte characters in Oracle:

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SELECT UPPER(column_name) COLLATE "NLS_UPPER(BINARY_CI)"
FROM table_name;


By following these steps, you can ensure that multi-byte characters are handled correctly when fetching uppercase values in Oracle.

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