Delete last N characters from field in a SQL Server database. How can I remove that N symbols using TSQL? Please note that I want to delete this characters from database, NOT just select substring. How to concatenate text from multiple rows into a single text string in SQL server? LEFT JOIN vs.
I have an SQL column where the entries are strings. I need to display those entries after trimming the last two characters, e.g. if the entry is 199902345
it should output 1999023
.
I tried looking into TRIM but looks like it offers to trim only if we know what are the last two characters. But in my case, I don't know what those last two numbers are and they just need to be discarded.
So, in short, what MySQL string operation enables to trim the last two characters of a string?
I must add that the length of the string is not fixed. It could be 9 characters, 11 characters or whatsoever.
M N4 Answers
To select all characters except the last n from a string (or put another way, remove last n characters from a string); use the SUBSTRING
and CHAR_LENGTH
functions together:
To remove a specific substring from the end of string, use the TRIM
function:
Why not using LEFT(string, length) function instead of substring.
you can visit here https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_left to know more about Mysql String Functions.
substring().
Denis de BernardyDenis de BernardyYou can use a LENGTH(that_string)
minus the number of characters
you want to remove in the SUBSTRING()
select perhaps or use the TRIM()
function.
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In SQL, how can I remove the first 4 characters of values of a specific column in a table? Column name is Student Code
and an example value is ABCD123Stu1231
.I want to remove first 4 chars from my table for all records
Please guide me
Ian R. O'Brien12 Answers
Edit:To explain, RIGHT takes 2 arguments - the string (or column) to operate on, and the number of characters to return (starting at the 'right' side of the string). LEN returns the length of the column data, and we subtract four so that our RIGHT function leaves the leftmost 4 characters 'behind'.
Hope this makes sense.
Edit again - I just read Andrew's response, and he may very well have interperpereted correctly, and I might be mistaken. If this is the case (and you want to UPDATE the table rather than just return doctored results), you can do this:
He's on the right track, but his solution will keep the 4 characters at the start of the string, rather than discarding said 4 characters.
Aaron AltonAaron AltonThis says, starting with the first 1
character position, replace 4
characters with nothing '
Why use LEN so you have 2 string functions? All you need is character 5 on...
gbngbnHere's a simple mock-up of what you're trying to do :)
So, use the last statement against the field you want to trim :)
The SUBSTRING function trims down Code1, starting at the FIFTH character, and continuing for the length of CODE1 less 4 (the number of characters skipped at the start).
RobRobThere's the built-in trim function that is perfect for the purpose.
It would be good to share, For DB2 use:INSERT(someColumn, 1, 4, ')
Stuff
is not supported in DB2
If you have to remove the first few characters that are preceded by a special character like #
, this is a good one:
The top answer has some surprising behavior when the length of the string is less than expected, because passing negative values to RIGHT trims the first characters instead of the entire string. It makes more sense to just use RIGHT(MyColumn, -5)
instead.