sql query exact search than others - sql

Question

I have table that has many columns. But we consider here 2 columns.
Name is Column1 and Column2. And table name is WordTable. I just want to search 50 record bases on those 2 column that match like below.
If I enter "auto" then result should be.
"auto"
"autoa"
"autoab"
.
.
.
Etc
If I enter "maver", result should be
"maver"
"mavera"
"maverr"
"maverx"
"maverydsdb"
Means First word should exact match the rest of after ascending order. And match should be done from any of the tow columns.
Below are my query but doesn't work.
searchWord(value) async {
var res = await db.rawQuery("SELECT *
FROM WordTable
WHERE (Column1 LIKE '$value%' OR Column2 LIKE '$value%')
ORDER BY Column1 ASC, Column2 ASC
LIMIT 50");
List<Word> list =
res.isNotEmpty ? res.map((c) => Word.fromJson(c)).toList() : [];
return list;
}
Getting result but not in expect order.
Where I'm going wrong? Pls guide me.
I'm coming from mobile platform and using "SQFLite" data base so for me query is important.

Answer 1

There are two tricks here. The first is to order by something that doesn't actually exist in the table, ie the part of the word after "$value". You can use sqlite substr and sqlite length to find that part, something like substr(column,length($value)). Since the desired result is the "whole" word, it can be put back together with concatenation operator ||, something like $value||substr(column,length($value)).
The second trick is to select column1 OR column2 into the same result field so they can be ordered as one column. One way to accomplish that would be with a UNION query.
With data like this:
column1 column2
---------- ----------
autob autoa
mavery autoc
maverz mavera
autoz maverq
autoa autob
This query:
select 'auto'||substr(column1,length('auto') + 1) word
from wordTable
where column1 like 'auto%'
UNION
select 'auto'||substr(column2,length('auto')+1)
from wordTable
where column2 like 'auto%'
order by 1
Returns this result:
word
----------
autoa
autob
autoc
autoz
ADDENDUM
Upon further reflection, I rather overthunk it. The first "trick" is moot if you use the UNION with the matching "words" in the same result column as with:
SELECT column1,*
from wordTable
where column1 like '$value%'
UNION
SELECT column2,*
from wordTable
where column2 like '$value%'
ORDER BY 1

Answer 2

I think you need to use + connect string to fill your parameter otherwise you will only execute this sql.
SELECT * FROM WordTable WHERE (Column1 LIKE '$value%' OR Column2 LIKE '$value%') ORDER BY Column1 ASC, Column2 ASC LIMIT 50
I am not sure what language you use I would suggest you use parameters to avoid sql-injection.
"SELECT * FROM WordTable WHERE (Column1 LIKE '"+$value+"%' OR Column2 LIKE '"+$value%+"') ORDER BY Column1 ASC, Column2 ASC LIMIT 50"

Answer 3

You can try this code for order:
SELECT *
FROM WordTable
WHERE (Column1 LIKE '$value%' OR Column2 LIKE '$value%')
ORDER BY Column1 = '$value' DESC, Column1 LIKE '$value%' DESC,
Column2 = '$value' DESC, Column2 LIKE '$value%' DESC,
Column1 ASC, Column2 ASC
LIMIT 50