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Strip last two characters of a column in MySQL

Posted by: admin November 1, 2017 Leave a comment

Questions:

I have an SQL column where the entries are strings. I need to spit out 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 trimming 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 needs 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 character, 11 character or whatsoever.

Answers:

Use the MySQL SUBSTRING function to extract portion of a string. Use CHAR_LENGTH function to calculate the number of characters in the string.

SELECT 
    col,
    SUBSTRING(col, 1, CHAR_LENGTH(col) - 2) AS col_trimmed
FROM tbl

Questions:
Answers:

Why not using LEFT(string, length) function instead of substring.

LEFT(col,length(col)-2) 

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.

Questions:
Answers:

substring().

http://dev.mysql.com/doc/refman/5.0/en/string-functions.html

Questions:
Answers:

You 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.