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.
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, /* ANSI Syntax */ SUBSTRING(col FROM 1 FOR CHAR_LENGTH(col) - 2) AS col_trimmed, /* MySQL Syntax */ SUBSTRING(col, 1, CHAR_LENGTH(col) - 2) AS col_trimmed FROM tbl
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.
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.
