Adding columns based on the value from the nearest column
I need to kind of normalize a table and specifically add values inside it in a different way.
So, I have this table which looks like this:
id | user_id | option1
1 1 6
If this user has another option I need to update the column with a second option and place there the option. This would look like this:
id | user_id | option1 | option2 |
1 1 6 7
But the problem is if there is another user and he also has an option, now the table should look like this:
id | user_id | option1 | option2 |
1 1 6 7
2 2 3
The thing is that I need a query that whenever I need to insert an option it checks if the last column has a value and if not place the value there but if it has create another column and place it there, so that way each user would have only one row. What's the easiest way to do this?
mysql
edited Nov 25 '18 at 23:23
Micha Wiedenmann
10.4k1364104
asked Nov 25 '18 at 23:19
Truica SorinTruica Sorin
737
add a comment |
I need to kind of normalize a table and specifically add values inside it in a different way.
So, I have this table which looks like this:
id | user_id | option1
1 1 6
If this user has another option I need to update the column with a second option and place there the option. This would look like this:
id | user_id | option1 | option2 |
1 1 6 7
But the problem is if there is another user and he also has an option, now the table should look like this:
id | user_id | option1 | option2 |
1 1 6 7
2 2 3
The thing is that I need a query that whenever I need to insert an option it checks if the last column has a value and if not place the value there but if it has create another column and place it there, so that way each user would have only one row. What's the easiest way to do this?
mysql
edited Nov 25 '18 at 23:23
Micha Wiedenmann
10.4k1364104
asked Nov 25 '18 at 23:19
Truica SorinTruica Sorin
737
I would respectfully suggest that your database structure has not been thought through correctly if this is your scenario. The options should surely appear in their own table that has a FK to the user table?
– Martin
Nov 25 '18 at 23:25
The table looks like this because i need to export it's content later in a text file so it's easier to keep the data like this
– Truica Sorin
Nov 25 '18 at 23:29
I find that a difficult argument to accept; The structure you have adopted is not normalised, and is also the cause of the difficulty you are experiencing now.
– Martin
Nov 25 '18 at 23:33
add a comment |
I need to kind of normalize a table and specifically add values inside it in a different way.
So, I have this table which looks like this:
id | user_id | option1
1 1 6
If this user has another option I need to update the column with a second option and place there the option. This would look like this:
id | user_id | option1 | option2 |
1 1 6 7
But the problem is if there is another user and he also has an option, now the table should look like this:
id | user_id | option1 | option2 |
1 1 6 7
2 2 3
The thing is that I need a query that whenever I need to insert an option it checks if the last column has a value and if not place the value there but if it has create another column and place it there, so that way each user would have only one row. What's the easiest way to do this?
mysql
edited Nov 25 '18 at 23:23
Micha Wiedenmann
10.4k1364104
asked Nov 25 '18 at 23:19
Truica SorinTruica Sorin
737
I need to kind of normalize a table and specifically add values inside it in a different way.
So, I have this table which looks like this:
id | user_id | option1
1 1 6
If this user has another option I need to update the column with a second option and place there the option. This would look like this:
id | user_id | option1 | option2 |
1 1 6 7
But the problem is if there is another user and he also has an option, now the table should look like this:
id | user_id | option1 | option2 |
1 1 6 7
2 2 3
The thing is that I need a query that whenever I need to insert an option it checks if the last column has a value and if not place the value there but if it has create another column and place it there, so that way each user would have only one row. What's the easiest way to do this?
mysql
mysql
edited Nov 25 '18 at 23:23
Micha Wiedenmann
10.4k1364104
asked Nov 25 '18 at 23:19
Truica SorinTruica Sorin
737
edited Nov 25 '18 at 23:23
Micha Wiedenmann
10.4k1364104
asked Nov 25 '18 at 23:19
Truica SorinTruica Sorin
737
edited Nov 25 '18 at 23:23
Micha Wiedenmann
10.4k1364104
edited Nov 25 '18 at 23:23
Micha Wiedenmann
10.4k1364104
edited Nov 25 '18 at 23:23
Micha Wiedenmann
10.4k1364104
10.4k1364104
asked Nov 25 '18 at 23:19
Truica SorinTruica Sorin
737
asked Nov 25 '18 at 23:19
Truica SorinTruica Sorin
737
asked Nov 25 '18 at 23:19
Truica SorinTruica Sorin
737
737
I would respectfully suggest that your database structure has not been thought through correctly if this is your scenario. The options should surely appear in their own table that has a FK to the user table?
– Martin
Nov 25 '18 at 23:25
The table looks like this because i need to export it's content later in a text file so it's easier to keep the data like this
– Truica Sorin
Nov 25 '18 at 23:29
I find that a difficult argument to accept; The structure you have adopted is not normalised, and is also the cause of the difficulty you are experiencing now.
– Martin
Nov 25 '18 at 23:33
add a comment |
I would respectfully suggest that your database structure has not been thought through correctly if this is your scenario. The options should surely appear in their own table that has a FK to the user table?
– Martin
Nov 25 '18 at 23:25
The table looks like this because i need to export it's content later in a text file so it's easier to keep the data like this
– Truica Sorin
Nov 25 '18 at 23:29
I find that a difficult argument to accept; The structure you have adopted is not normalised, and is also the cause of the difficulty you are experiencing now.
– Martin
Nov 25 '18 at 23:33
I would respectfully suggest that your database structure has not been thought through correctly if this is your scenario. The options should surely appear in their own table that has a FK to the user table?
– Martin
Nov 25 '18 at 23:25
I would respectfully suggest that your database structure has not been thought through correctly if this is your scenario. The options should surely appear in their own table that has a FK to the user table?
– Martin
Nov 25 '18 at 23:25
The table looks like this because i need to export it's content later in a text file so it's easier to keep the data like this
– Truica Sorin
Nov 25 '18 at 23:29
The table looks like this because i need to export it's content later in a text file so it's easier to keep the data like this
– Truica Sorin
Nov 25 '18 at 23:29
I find that a difficult argument to accept; The structure you have adopted is not normalised, and is also the cause of the difficulty you are experiencing now.
– Martin
Nov 25 '18 at 23:33
I find that a difficult argument to accept; The structure you have adopted is not normalised, and is also the cause of the difficulty you are experiencing now.
– Martin
Nov 25 '18 at 23:33
add a comment |
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I would respectfully suggest that your database structure has not been thought through correctly if this is your scenario. The options should surely appear in their own table that has a FK to the user table?
– Martin
Nov 25 '18 at 23:25
The table looks like this because i need to export it's content later in a text file so it's easier to keep the data like this
– Truica Sorin
Nov 25 '18 at 23:29
I find that a difficult argument to accept; The structure you have adopted is not normalised, and is also the cause of the difficulty you are experiencing now.
– Martin
Nov 25 '18 at 23:33