ID | First Name | Last Name |
-----------------------------
1 | Test | NULL |
2 | Test | ABC1 |
I need to merge these two rows into one to display as so the null in 'last name' will be replaced by the text in the second column, Grouping by the first name.
ID | First Name | Last Name |
-----------------------------
1 | Test | ABC1|
try this:
select min (id),First_Name,MAX(Last_Name)
from your_table
group by First_Name
Related
Let me say i have a table called test with the following data
+---------+-----------------+
| id | t_number |
+---------+-----------------+
| 1 | 864291100247345 |
| 2 | 355488020906457 |
| 3 | 864296100098739 |
| 4 | 864296100098325 |
| 5 | 864296100119956 |
What i want to do is to be able to write a select statement that returns a 3 rows with two random values and one mandatory value from the t_number column
for example if the mandatory value is 864291100247345 the output should something like below
+---------+-----------------+
| id | t_number |
+---------+-----------------+
| 1 | 864291100247345 |
| 2 | 355488020906457 |
| 4 | 864296100098325 |
OR
+---------+-----------------+
| id | t_number |
+---------+-----------------+
| 1 | 864291100247345 |
| 3 | 864296100098739 |
| 4 | 864296100098325 |
I have tried the below query but it's not yielding the output i expect, in a sense that it does return a result but without the mandatory value
SELECT * FROM test WHERE t_number = 864291100247345 OR id LIMIT 3;
What is the best way to go about this?
Thank you.
You can use order by:
SELECT t.*
FROM test
ORDER BY (t_number = 864291100247345) DESC,
rand()
LIMIT 3;
This returns the mandatory number first and then random numbers after that.
MySQL treats boolean values (the result of the = expression) as numbers in a numeric context, with "1" for true and "0" for false. So the first expression in the order by sorts the result set with the "true" conditions first, followed by the others.
I am trying to get data from database by matching first two characters or the characters appears before comma ,
id | company_name | country_id | city_id | main_category
-------------------------------------------------------
1 | ABC | 1 | 2 | 12,3,6
2 | XYZ | 1 | 2 | 1,12,9
what I want is to get the following results when the user input is 12 and if 12 exist in main_category than result should be shown but the 12 should be exits before the first comma or we can say the first two characters
id | company_name | country_id | city_id | main_category
-------------------------------------------------------
1 | ABC | 1 | 2 | 12,3,6
Query I tried
$getResult = $companies->where([
["company_name", "LIKE", "%$keyword%"],
['main_category', "LIKE", "%$sector%"]
])->get();
If you want to match query start from beginning and end with a comma, you can do the following-
$getResult = $compaies->where("company_name", "LIKE", "%$keyword%")->where('main_category', "LIKE", "$sector,%")->get();
I have a table with this sort of data:
+------------+----------+----------+
| Unique ID | Name | Class |
+------------+----------+----------+
| 1 | Name 1 | Class A |
| 2 | Name 2 | "" |
| 3 | Name 3 | Class C |
| 4 | Name 1 | "" |
| 5 | Name 4 | "" |
| 6 | Name 4 | "" |
+------------+----------+----------+
I am trying to do something I thought was simple, but i did not find so.
I am trying to "extract" only the lines with an empty string value in 'Class' for a group of equal names.
So in this case I would get this result :
+------------+----------+--------+
| Unique ID | Name | Class |
+------------+----------+--------+
| 2 | Name 2 | "" |
| 5 | Name 4 | "" |
+------------+----------+--------+
So not Name 1 because even though there is a line with "" there is another line with 'Class A'.
I thought a UNION would do the job but I am not gettgin anything because I think unions are for two tables but the problem here is I have the data in the same table.
Thank you for your help
Access syntax may be a bit different but this returns what you want in Oracle:
SELECT distinct Name, Class FROM table1 Where Name NOT in (select name from table1 where class is not null)
A Union melds two result sets, whether or not they come from the same table is irrelevant. What you want to do is omit from the result set the rows with the same name AND class is not null. Not having your query to expand on or change is a problem, but if you add a clause that says something like where "name not in (select name from table where class is not null);", that may do it.
Hello i want to split a resulting column in multiple columns just like on the link. But number of columns are not specific ;
Example
COL1 | OTHER COLUMNS
----------------------------------------
this,will,split | some value
also,this | some value
this,is,four,columns | some value
I want make this something like that ;
COL1 | COL2 | COL3 | COL4 | OTHER
----------------------------------------
this | will | split| NULL | some value
also | this | NULL | NULL | some value
this | is | four | columns| some value
edit
it looks like similar that question but not:
Can you split/explode a field in a MySQL query?
I want results in 1 row, I dont want something like that;
RESULT
-----
this
will
split
...
on that question you can see there is specific number of cols. bu i dont. :(
How to split a resulting column in multiple columns
I think you can create one relational table and add multiple entry in relational table, hear you don't need to think about column, you have to add entry in row.
eg.
Table 1:
ID | COL1 | OTHER COLUMNS
----------------------------------------
1 |this,will,split | some value
2 |also,this | some value
3 |this,is,four,columns | some value
Table2
ID | Table1_id | value
-------------------------
1 | 1 | this
2 | 1 | will
3 | 1 | split
4 | 2 | also
5 | 2 | this
6 | 3 | this
6 | 3 | is
6 | 3 | four
6 | 3 | columns
Please check this, i think fix your problem.
I'm wondering how to filter Hibernate results.
For example, I have this example table:
--------------------------------------------
| ID | STRING | DATE |
--------------------------------------------
| 1 | "ABC" | 2014-11-07 21:45:00 |
--------------------------------------------
| 2 | "ABC" | 2014-11-07 22:45:00 |
--------------------------------------------
| 3 | "DCE" | 2014-11-07 22:48:00 |
--------------------------------------------
| 4 | "ABC" | 2014-11-07 23:48:00 |
--------------------------------------------
The result that I need is:
--------------------------------------------
| ID | STRING | DATE |
--------------------------------------------
| 3 | "DCE" | 2014-11-07 22:48:00 |
--------------------------------------------
| 4 | "ABC" | 2014-11-07 23:48:00 |
--------------------------------------------
All lines of table, BUT, when I have the same content in column STRING, the column with the most recent DATE is the one in result set.
In hibernate I know
- select ALL lines;
- select the repeated lines and keep only the most recent.
But I don't know how to combine the two situations together, and I can't find it referenced anywhere.
I have a fixed length in STRING, and I use a fake primary key in my code to identify the register, but the value is inserted by user, and I have no previous knowledge of the content in the column.
You can do this using a not exists clause:
select e.*
from example e
where not exists (select 1 from example e2 where e2.string = e.string and e2.date > e.date);
That is, select all rows where there is no other row with the same string and a larger date.