How do you reverse a substring in SQL?

SQL Server REVERSE() Function The REVERSE() function reverses a string and returns the result.

How can I reverse a string in SQL Server without reverse function?

Reverse String In SQL Server Without REVERSE Function

  1. CREATE function StringReverse(@inputstring varchar(max))
  2. returns varchar(max)
  3. AS.
  4. BEGIN.
  5. DECLARE @i int,
  6. @Result varchar(max)
  7. SET @Result=”
  8. SET @i = 1.

How do I reverse the order of data in SQL?

The SQL ORDER BY Keyword The ORDER BY keyword sorts the records in ascending order by default. To sort the records in descending order, use the DESC keyword.

What is palindrome in SQL Server?

SQL Server REVERSE() function examples A palindrome is a word that reads the same backward as forwarding e.g., madam or redivider . The following example uses the REVERSE() function and CASE expression to check if a string is a palindrome.

What is rollback in SQL?

In SQL, ROLLBACK is a command that causes all data changes since the last BEGIN WORK , or START TRANSACTION to be discarded by the relational database management systems (RDBMS), so that the state of the data is “rolled back” to the way it was before those changes were made.

What is right outer join in SQL?

A right outer join is a method of combining tables. The result includes unmatched rows from only the table that is specified after the RIGHT OUTER JOIN clause. If you are joining two tables and want the result set to include unmatched rows from only one table, use a LEFT OUTER JOIN clause or a RIGHT OUTER JOIN clause.

How do I get alphabetical order in SQL?

If you want to sort based on two columns, separate them by commas. For example, ORDER BY LAST_NAME ASC, FIRST_NAME DESC; would display results sorted alphabetically by last name. If the same LAST_NAME matches multiple FIRST_NAME entries, the results of FIRST_NAME will also display in descending order.

How do I ROLLBACK a SQL Server database?

In the below example, we do the following tasks.

  1. Declare a table variable @Demo.
  2. Insert a record into it.
  3. Starts an explicit transaction using BEGIN TRANSACTION.
  4. Update the record in the table variable.
  5. Rollback transaction.
  6. Check the value of the record in the table variable.

Why ROLLBACK is used in SQL?

ROLLBACK in SQL is a transactional control language that is used to undo the transactions that have not been saved in the database. The command is only been used to undo changes since the last COMMIT.

Why do we need left and right outer join?

if you are using join in sql and join three tables in single query and with 2 tables using left join and you want all records of third table then you can’t use left join with 3rd table, so you have to use right join with 3rd table.

How does left and right join work?

A left and right refer to where a table resides in relationship to the FROM clause. The left table is the table that is in the FROM clause, or left of the join condition, the join clause here. And a right table is on the right side of the join clause.

Is alphabetical order ascending or descending?

Still it’s easy to remember: ascending = increasing for numbers and alphabetical order for letters. Descending = the opposite.

How to get a substring in SQL?

The source_string is the string from which you want to extract the substring.

  • The position is the starting position where the substring begins. The first position of the string is one (1).
  • The length is the length of the substring. The length argument is optional.

    • How to use substr in SQL?

    string (mandatory): This is the base string value that the substring is obtained from.

  • start_position (mandatory): This is the starting position of the substring within the string. It’s where the substring starts from.
  • length (optional): This is the number of characters to extract from string,to create the substring.

    • How to trim everything after certain character in SQL?

    – original_string is the text or reference to the cell that you want to work on. – old_character is the character that you want to replace. – new_character is the character that you want to replace old_character with. – instance_number is the instance of the old_character that you want to replace.

    How do you find a string in SQL?

    – Example. SELECT CHARINDEX (‘Bob’, ‘Bob likes beer. – No Match. If the second argument didn’t contain Bob the result would’ve been 0. – Specifying a Starting Position. You can specify a starting position for where to start searching. – Case-Sensitivity. SELECT CHARINDEX (‘Beer’, ‘Bob likes beer.’ This is case-sensitive because _CS stands for Case-Sensitive.

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