How to use GROUP BY to concatenate strings in MySQL?
SELECT id, GROUP_CONCAT(name SEPARATOR ' ') FROM table GROUP BY id;
https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_group-concat
From the link above, GROUP_CONCAT
: This function returns a string result with the concatenated non-NULL values from a group. It returns NULL if there are no non-NULL values.
How to use GROUP BY to concatenate strings in SQL Server?
No CURSOR, WHILE loop, or User-Defined Function needed.
Just need to be creative with FOR XML and PATH.
[Note: This solution only works on SQL 2005 and later. Original question didn't specify the version in use.]
CREATE TABLE #YourTable ([ID] INT, [Name] CHAR(1), [Value] INT)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (1,'A',4)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (1,'B',8)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (2,'C',9)
SELECT
[ID],
STUFF((
SELECT ', ' + [Name] + ':' + CAST([Value] AS VARCHAR(MAX))
FROM #YourTable
WHERE (ID = Results.ID)
FOR XML PATH(''),TYPE).value('(./text())[1]','VARCHAR(MAX)')
,1,2,'') AS NameValues
FROM #YourTable Results
GROUP BY ID
DROP TABLE #YourTable
How to use GROUP BY to concat strings in mysql
You can use the GROUP_CONCAT()
function get the values into a single row and you can use user-defined variables to assign the number to each value in the sid
group:
select sid,
group_concat(concat(rn, '. ', string) ORDER BY id SEPARATOR ' ') string
from
(
select id,
sid,
string,
@row:=case when @prev=sid then @row else 0 end +1 rn,
@prev:=sid
from yourtable
cross join (select @row:= 0, @prev:=null) r
order by id
) src
group by sid
See SQL Fiddle with Demo, The result is:
| SID | STRING |
-----------------------
| 1 | 1. AAA 2. BBB |
| 2 | 1. CCC |
| 3 | 1. ZZZ 2. EEE |
MySQL String concatenation of Title and Name
You need to join the title
s table to get the values from it. Use an on
for how the data should join
.
SELECT CONCAT(t.title, '. ', pt.FirstName)
FROM PatientTable as pt
join Title as t
on pt.PatTitleLookup = t.id
WHERE pt.PatientTableID = 1
I also have used aliases (as pt
, as t
) here for your tables, makes referencing shorter later in queries.
How to use GROUP BY to concatenate strings while joining multiple tables?
You can specify a CTE – common table expression to store your temporary result :
with cteTbl ( CardID
, TechName
, problemReported ) as (
select j.CardID
, p.ProblemReported
, ( select TechnicianName
from easy_tbltechnicianMaster
where TechnicianID = t.technicianID ) as TechName
from easy_tbljobcard as j
join easy_technician as t on t.CardID = j.CardID
left join easy_tblproblem as p on p.CardID = t.CardID )
And then select
from it and concatenate all column values with the same t.techName
and t.CardID
in one row with for xml path('')
and after that replace the first comma ,
with stuff
:
select t.CardID
, t.TechName
, stuff( ( select ', ' + ProblemReported
from cteTbl
where TechName = t.TechName
order by ProblemReported
for xml path('') ), 1, 1, '') AS ProblemReported
from cteTbl t
group by t.TechName
, t.CardID
SQLFiddle
How to use GROUP_CONCAT in a CONCAT in MySQL
select id, group_concat(`Name` separator ',') as `ColumnName`
from
(
select
id,
concat(`Name`, ':', group_concat(`Value` separator ',')) as `Name`
from mytbl
group by
id,
`Name`
) tbl
group by id;
You can see it implemented here : Sql Fiddle Demo. Exactly what you need.
Update
Splitting in two steps. First we get a table having all values(comma separated) against a unique[Name,id]. Then from obtained table we get all names and values as a single value against each unique id
See this explained here SQL Fiddle Demo (scroll down as it has two result sets)
Edit There was a mistake in reading question, I had grouped only by id. But two group_contacts are needed if (Values are to be concatenated grouped by Name and id and then over all by id). Previous answer was
select
id,group_concat(concat(`name`,':',`value`) separator ',')
as Result from mytbl group by id
You can see it implemented here : SQL Fiddle Demo
Concatenating strings in the return set of a GROUP BY clause in CockroachDB
You can use the concat_agg
function on the column you want to concatenate together.
Using your example above, you’d run:
SELECT concat_agg(Description)
FROM Orders
GROUP BY Order_ID
ORDER BY Order_ID;
This will produce an output with all of the descriptions concatenated, grouped by order id.
Can I concatenate multiple MySQL rows into one field?
You can use GROUP_CONCAT
:
SELECT person_id,
GROUP_CONCAT(hobbies SEPARATOR ', ')
FROM peoples_hobbies
GROUP BY person_id;
As Ludwig stated in his comment, you can add the DISTINCT
operator to avoid duplicates:
SELECT person_id,
GROUP_CONCAT(DISTINCT hobbies SEPARATOR ', ')
FROM peoples_hobbies
GROUP BY person_id;
As Jan stated in their comment, you can also sort the values before imploding it using ORDER BY
:
SELECT person_id,
GROUP_CONCAT(hobbies ORDER BY hobbies ASC SEPARATOR ', ')
FROM peoples_hobbies
GROUP BY person_id;
As Dag stated in his comment, there is a 1024 byte limit on the result. To solve this, run this query before your query:
SET group_concat_max_len = 2048;
Of course, you can change 2048
according to your needs. To calculate and assign the value:
SET group_concat_max_len = CAST(
(SELECT SUM(LENGTH(hobbies)) + COUNT(*) * LENGTH(', ')
FROM peoples_hobbies
GROUP BY person_id) AS UNSIGNED);
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