MySQL combine two columns into one column
MysqlSqlMysql Problem Overview
I'm trying to find a way to combine two columns into one, but keep getting the value '0' in the column instead to the combination of the words.
These are what I've tried as well as others:
SELECT column1 + column2 AS column3
FROM table;
SELECT column1 || column2 AS column3
FROM table;
SELECT column1 + ' ' + column2 AS column3
FROM table;
Could someone please let me know what I'm doing wrong?
Mysql Solutions
Solution 1 - Mysql
My guess is that you are using MySQL where the + operator does addition, along with silent conversion of the values to numbers. If a value does not start with a digit, then the converted value is 0.
So try this:
select concat(column1, column2)
Two ways to add a space:
select concat(column1, ' ', column2)
select concat_ws(' ', column1, column2)
Solution 2 - Mysql
Try this, it works for me
select (column1 || ' '|| column2) from table;
Solution 3 - Mysql
It's work for me
SELECT CONCAT(column1, ' ' ,column2) AS newColumn;
Solution 4 - Mysql
This is the only solution that would work for me, when I required a space in between the columns being merged.
select concat(concat(column1,' '), column2)
Solution 5 - Mysql
If you are Working On Oracle Then:
SELECT column1 || column2 AS column3
FROM table;
OR
If You Are Working On MySql Then:
SELECT Concat(column1 ,column2) AS column3
FROM table;
Solution 6 - Mysql
For the MySQL fans out there, I like the IFNULL() function. Other answers here suggest similar functionality with the ISNULL() function in some implementations. In my situation, I have a column of descriptions which is NOT NULL, and a column of serial numbers which may be NULL This is how I combined them into one column:
SELECT CONCAT(description,IFNULL(' SN: ', serial_number),'')) FROM my_table;
My results suggest that the results of concatenating a string with NULL results in a NULL. I have been getting the alternative value in those cases.
Solution 7 - Mysql
I have used this way and Its a best forever. In this code null also handled
SELECT Title,
FirstName,
lastName,
ISNULL(Title,'') + ' ' + ISNULL(FirstName,'') + ' ' + ISNULL(LastName,'') as FullName
FROM Customer
Try this...
Solution 8 - Mysql
table:
---------------------
| column1 | column2 |
---------------------
| abc | xyz |
---------------------
In Oracle:
SELECT column1 || column2 AS column3
FROM table_name;
Output:
table:
---------------------
| column3 |
---------------------
| abcxyz |
---------------------
If you want to put ',' or '.' or any string within two column data then you may use:
SELECT column1 || '.' || column2 AS column3
FROM table_name;
Output:
table:
---------------------
| column3 |
---------------------
| abc.xyz |
---------------------
Solution 9 - Mysql
convert(varchar, column_name1) + (varchar, column_name)
Solution 10 - Mysql
SELECT Column1 + ' - ' + Column2 AS 'FullName' FROM TableName
Solution 11 - Mysql
SELECT CONVERT (nvarchar (10), Month(NextDate))+'-'+CONVERT (nvarchar (10), Year(NextDate)) as MonthOfYear, COUNT(CaseNo) as CountDisposal
FROM dbo.Main_Cause_List
WHERE (DisposalState = 'Dispossed-off')
GROUP BY Month(NextDate),Year(NextDate);
Solution 12 - Mysql
try to use coalesce() and concat() to combine columns in the SQL query.
Assume that you have 4 columns (id, name, phone_number, country_code) in a user table and you want to print phone number in this format: +countrycodephonenumber
Eg: 1, vishnu, 9961907453, 91 will return phone number as +919961907453.
You can use the following query to get the above result.
select coalesce(concat('+', country_code, phone_number)) from user;