Technology & Computing

How do you use substring in SQL?

By: Sanjay HarbolaUpdated: April 25, 2021


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    August 19, 2022
SQL Server SUBSTRING() Function
  1. Extract 3 characters from a string, starting in position 1: SELECT SUBSTRING('SQL Tutorial', 1, 3) AS ExtractString;
  2. Extract 5 characters from the "CustomerName" column, starting in position 1:
  3. Extract 100 characters from a string, starting in position 1:

Likewise, people ask, what is Substr in Oracle?

The SUBSTR functions returns the specified number (substring_length) of characters from a particular position of a given string. SUBSTRB uses bytes instead of characters. If the position is positive, then Oracle Database counts from the beginning of char to find the first character.

Beside above, how do I get the first 3 characters of a string in SQL?

You can use LEN() or LENGTH()(in case of oracle sql) function to get the length of a column. SELECT LEN(column_name) FROM table_name; And you can use SUBSTRING or SUBSTR() function go get first three characters of a column.

How do I find a specific word in a string in Oracle?

The Oracle/PLSQL REGEXP_INSTR function is an extension of the INSTR function. It returns the location of a regular expression pattern in a string. This function, introduced in Oracle 10g, will allow you to find a substring in a string using regular expression pattern matching.

How do substring () and substr () differ?

substring() The difference is in the second argument. The second argument to substring is the index to stop at (but not include), but the second argument to substr is the maximum length to return. Moreover, substr() accepts a negative starting position as an offset from the end of the string.


How do I substring a date in SQL?

Using the SQL Server SUBSTRING function, the input values are truncated using CHARINDEX or PATINDEX function to get the date-time value. And then the derived string is type-casted to DateTime so that it can be used to compare with other DateTime values. In this case, it's compared against the SQL GETDATE() function.

How do you concatenate in SQL?

SQL Server CONCAT() Function
  1. Add two strings together: SELECT CONCAT('W3Schools', '.com');
  2. Add 3 strings together: SELECT CONCAT('SQL', ' is', ' fun!' );
  3. Add strings together (separate each string with a space character): SELECT CONCAT('SQL', ' ', 'is', ' ', 'fun!' );

How do I find a string in SQL?

SQL Server CHARINDEX() Function
The CHARINDEX() function searches for a substring in a string, and returns the position. If the substring is not found, this function returns 0. Note: This function performs a case-insensitive search.

What is Instr in SQL?

In Oracle, INSTR function returns the position of a substring in a string, and allows you to specify the start position and which occurrence to find. In SQL Server, you can use CHARINDEX function that allows you to specify the start position, but not the occurrence, or you can use a user-defined function.

What is substring in SQL with example?

The SUBSTRING() extracts a substring with a specified length starting from a location in an input string. The following shows the syntax of the SUBSTRING() function: SUBSTRING(input_string, start, length); In this syntax: input_string can be a character, binary, text, ntext, or image expression.

Can we use substring in where clause?

The SUBSTRING SQL function is very useful when you want to make sure that the string values returned from a query will be restricted to a certain length. In the following example, using the 'firstname' column, the last two characters are matched with the word 'on' using the SQL SUBSTRING function in the where clause.

Why do we use substring in SQL?

The Substring function in SQL is used to return a portion of the string. Each database provides its own way(s) of doing this: MySQL: SUBSTR( ), SUBSTRING( )

How do I get the first letter of a string in SQL?

SELECT SUBSTRING(Col_Name, 1, 1) AS ExtractString; Parameters used in the SUBSTRING method is as follows: 1. Col_Name: This is required to extract the string.

Is like in SQL?

The SQL LIKE Operator
The LIKE operator is used in a WHERE clause to search for a specified pattern in a column. There are two wildcards often used in conjunction with the LIKE operator: % - The percent sign represents zero, one, or multiple characters. _ - The underscore represents a single character.

How do I get the first character of a string in SQL?

Searching from the start of a string expression. This example returns the first location of the string is in string This is a string , starting from position 1 (the first character) of This is a string . SELECT CHARINDEX('is', 'This is a string');

What is substring of a string?

A substring is a contiguous sequence of characters within a string. For instance, "the best of" is a substring of "It was the best of times". This is not to be confused with subsequence, which is a generalization of substring.

How do you check if a string contains a substring in SQL?

We can use the CHARINDEX() function to check whether a String contains a Substring in it. Name of this function is little confusing as name sounds something to do with character, but it basically returns the starting position of matched Substring in the main String.

How do I find the substring of a string in SQL query?

SQL Server CHARINDEX() function overview
SQL Server CHARINDEX() function searches for a substring inside a string starting from a specified location. It returns the position of the substring found in the searched string, or zero if the substring is not found. The starting position returned is 1-based, not 0-based.

How do I remove a character from a string in SQL?

SQL Server TRIM() Function
The TRIM() function removes the space character OR other specified characters from the start or end of a string. By default, the TRIM() function removes leading and trailing spaces from a string.

How do you truncate a string in SQL?

The basic syntax is SUBSTR(string, position, length), where position and length are numbers. For example, start at position 1 in the string countryName, and select 15 characters. Length is optional in MySQL and Oracle, but required in SQL Server.

Is null in Oracle?

You can use the Oracle IS NULL condition in PLSQL to check if a value is null. For example, IF Lvalue IS NULL then If Lvalue contains a null value, the "IF" expression will evaluate to TRUE.