How to Select A Substring In Oracle Sql?

To select a substring in Oracle SQL, you can use the SUBSTR function. This function takes three arguments: the string or column from which you want to extract a substring, the starting position of the substring, and the length of the substring.

For example, if you have a column called "name" in a table called "employees" and you want to select the first three characters of each name, you can use the following query:

SELECT SUBSTR(name, 1, 3) FROM employees;

This will extract the first three characters from the "name" column for each row in the "employees" table. You can adjust the starting position and length parameters to extract different substrings as needed.

How to select a substring ignoring case sensitivity in Oracle SQL?

To select a substring ignoring case sensitivity in Oracle SQL, you can use the UPPER() or LOWER() functions to convert the substring and the target string to the same case before comparing them.

Here is an example query that demonstrates how to select a substring ignoring case sensitivity:

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SELECT *
FROM your_table
WHERE UPPER(SUBSTR(column_name, start_position, length)) = UPPER('your_substring');

In the above query:

• column_name is the column where you want to search for the substring.
• start_position is the starting position of the substring in the column.
• length is the length of the substring.
• your_substring is the substring you want to select, ignoring case sensitivity.

By using the UPPER() function on both the substring from the column and the target substring, we ensure that the comparison is case-insensitive.

How to specify the length of a substring in Oracle SQL?

In Oracle SQL, you can specify the length of a substring using the SUBSTR function. The syntax for the SUBSTR function is as follows:

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SUBSTR(string, start_position, length)

Where:

• string is the source string from which you want to extract a substring
• start_position is the starting position in the source string from which the substring should begin (the first character in the source string is at position 1)
• length is the number of characters to be included in the substring

For example, if you have a string 'Hello World' and you want to extract a substring starting from the 7th character with a length of 5 characters, you would use the following query:

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SELECT SUBSTR('Hello World', 7, 5) FROM dual;

This would return 'World' as the output.

What is a substring in Oracle SQL and how to select it?

A substring in Oracle SQL is a portion of a string value. To select a substring in Oracle SQL, you can use the SUBSTR function.

The syntax for the SUBSTR function is:

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SUBSTR(string, start_position, length)

• string: the string value from which you want to extract the substring
• start_position: the starting position in the string from which to extract the substring
• length: the length of the substring to extract

For example, if you have a table called "employees" with a column "full_name" containing employee names, you can select a substring of the first 3 characters from the "full_name" column using the following query:

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SELECT SUBSTR(full_name, 1, 3) 
FROM employees;

This will return the first 3 characters of each employee's full name in the "full_name" column.