I have two columns in my database that I want to combine before matching them using LIKE statement.
My table:
|---------------------------------|
| ID | PREFIX | SUFFIX |
|---------------------------------|
| 1 | 31 | 523 |
|---------------------------------|
| 2 | 62 | 364 |
|---------------------------------|
I want to be able to supply 315 and ID 1 would be returned. Is there any easy way of doing it? At the moment I am splitting search string and matching separate columns.
Thanks.
SELECT * FROM table WHERE CONCAT(PREFIX, SUFFIX) LIKE '%315%'
Related
I have a special scenario to fetch "unique" row.
Let's say the database is like below
| id | userid | value | others |
|----|--------|-------|---------|
| 1 | 111 | 10 | string1 |
| 2 | 112 | 30 | string2 |
| 3 | 112 | 30 | string3 |
| 4 | 113 | 50 | string4 |
what I want to achieve is to fetch the unique rows based on the "userid" so I'am able to sum all values.
the expect output row can be either id: 1 2 4 or 1 3 4 (both is acceptable for this special case because same id guarantees same value, or in general, get just one row from those row with same userid. ), so the sum will be 90.
Note: DB is extended from Eloquent\model
My old approach is to get DB::unique('userid'); then for each userid DB::where('userid', $id)->value('value'), add the result to sum; I just believe there might be a better approach.
There is Illuminate\Support\Facades\DB in Laravel, it can return the Query Builder. Not recommend to use a model that is named DB.
So just change another name.
By the way, for Eloquent\Model, you can use groupBy and sum too:
Model::groupBy('user_id')->sum('value');
Here is my table:
| ID | NUMBER |
| 1 | 523 |
| 2 | 293 |
| 3 | 948 |
And now, I want to get all NUMBER values but I want to add in result two numbers - 48 - (without upadting existing results). So finally I want print these results:
| NUMBER |
| 48523 |
| 48293 |
| 48948 |
So I need a query, something like this:
SELECT '48' + `number` FROM `table`
but this query doesn't work fine (this query only update column name from NUMBER to 48 + NUMBER).
Any ideas?
Thanks.
You need CONCAT
SELECT CONCAT('48' , `number`) AS number FROM table
Demo
i have a table like this with a var char field reference_number
actually i need to get the max of number in that field
<<student>>
|`id` | `reference_number`(varchar(25))
--------------------------
| 1 | L250
| 2 | SP521
| 3 | S120
| 4 | SP500
| 5 | S122
the desired result is 521 because if we are avoiding the non numeric value then it will come like this
|`id` | `reference_number`
--------------------------
| 1 | 250
| 2 | 521
| 3 | 120
| 4 | 500
| 5 | 122
how to get the the value 521 from the table
I assume you have extracted 'reference_number' as shown in the second snippet from the first snippet. if so, try :::
select max(cast (reference_number as int)) from student
In order to get the number 521 (and all the numbers from the reference_number column) you could try:
SELECT *
FROM yourtable
WHERE reference_number REGEXP '^[0-9]+$';
And then you can add an order by statement.
I have two mysql tables as
Component
+----+-------------------------+--------+
| OldComponentId | NewComponentId |
+----+-------------------------+--------+
| 15 | 85 |
| 16 | 86 |
| 17 | 87 |
+----+-------------------------+--------+
Formulae
+----+-------------------------+--------+
| id | formula_string |
+----+-------------------------+--------+
| 1 | A+15-16+17 |
| 2 | 16+15-17 |
+----+-------------------------+--------+
I want to replace value of formula_string on the basis of NewComponentId as
Formulae
+----+-------------------------+--------+
| id | formula_string |
+----+-------------------------+--------+
| 1 | A+85-86+87 |
| 2 | 86+85-87 |
+----+-------------------------+--------+
I have tried with following mysql query but its not working
update Formulae fr, Component comp set formula_string=REPLACE(fr.formula_string,comp.OldComponentId,comp.NewComponentId).
Please suggest the solutions
thanks.
There is no easy way to do this. As you observed in your update statement, the replacements don't nest. They just replace one at a time.
One thing that you can do is:
update Formulae fr cross join
Component comp
set formula_string = REPLACE(fr.formula_string, comp.OldComponentId, comp.NewComponentId)
where formula_string like concat('%', comp.OldComponentId, '%')
Then continue running this until row_count() returns 0.
Do note that your structure could result in infinite loops (if A --> B and B --> A). You also have a problem of "confusion" so 10 would be replaced in 100. This suggests that your overall data structure may not be correct. Perhaps you should break up the formula into separate pieces. If they are just numbers and + and -, you can have a junction table with the value and the sign for each component. Then your query would be much easier.
I am having a table with data stored in row basis as shown below.
UID | DetailsID | Data|
----------------------|
1 | 1 | A |
1 | 2 | 200|
1 | 3 | 2010-10-11 08:32 |
2 | 1 | B |
2 | 2 | 600|
2 | 3 | 2011-05-20 14:56 |
From this I need the output as follows
UID|1|2|3
------------
1|A|200|2010-10-11 08:32
2|B|600|2011-05-20 14:56
Here main thing is, the number of entries of DetailsID values is not known.
I wanted this one in MySQL.
Please help me out of this.
Not quite what you want, but other than loads of left joins i can only suggest:
SELECT UID,GROUP_CONCAT(DetailsID SEPARATOR ",") "DetailsIDs",GROUP_CONCAT(Data SEPARATOR ",") "Data" FROM data_table GROUP BY UID;
Do that transformation in your coding language, not in SQL.
you didnt say where you need the output. If you need the output in PHP pages it is simple only by creating the loop for the entries in columns wise.