MySQL delete lines that contains specific word - mysql

Question

I'm trying to delete lines in specific column from all rows that contains specific words.
For example:
Remove lines that contain word apple and it is always at the beginning of the line.
+--+------------------+
|ID|data |
+--+------------------+
|1 |sometext1 |
| |sometext2 |
| |apple sometext3 |
| |sometext4 |
+--+------------------+
|2 |apple sometext5 |
| |sometext6 |
+--+------------------+
so the result would be:
+--+------------------+
|ID|data |
+--+------------------+
|1 |sometext1 |
| |sometext2 |
| |sometext4 |
+--+------------------+
|2 |sometext6 |
+--+------------------+
'SometextX' is different in every line, number of lines is different in every row and it has different number of characters in every line.
I really need this in MySQL any help would be appreciated.

Answer 1

You would be better off using REGEXP here to match patterns in each line:
DELETE FROM yourTable WHERE text REGEXP '^apple';
REGEXP allows for fairly complex regex matching, and would be useful if your requirement changes or gets more complex later on.
Edit: MySQL has no built in support for regex replacement, so there is no easy way to accomplish what you want.
A general regex pattern to remove the word apple would be \bapple\b. You may search on this pattern and replace with empty string.

Answer 2

You would use where:
where textcol not like 'apple%' or textcol is null
This can be part of a select or a delete (the question mentions "result" which suggests the former and "delete" which suggests the latter). It is not clear whether you actually want to change the data or whether you just want the result set without these words.
Note: you can do this without or and still handle NULL values, because MySQL has a NULL-safe equality operator:
where not left(textcol, 5) <=> 'apple'

Answer 3

You can use MySQL functions to select the right rows and to update with new data as follows:
UPDATE `yourTable` SET `yourField` = REPLACE(yourField, 'apple', '') WHERE yourField LIKE '%apple%'

Answer 4

If you don't want to delete the whole row, you can run these 3 queries in this order
update your_table set text=replace(text,substring(text,#start:=locate('\napple',text),locate('\n',text,#start+1)-#start+1),'');
update your_table set text=if((#start:=locate('apple',text))=1,replace(text,substring(text,#start,locate('\n',text,#start+1)-#start+1),''),text);
update your_table set text=if((#start:=locate('apple',text))=1,replace(text,substring(text,locate('apple',text)),''),text);
update #1 will remove apple in the middle of the text (prefixed by \n)
update #2 will remove apple at the beginning of its row (nothing before) and having following rows
update #3 will remove remaining cases