What I’m trying to do is INSERT subscribers in my database, but IF EXISTS it should UPDATE the row, ELSE INSERT INTO a new row. Ofcourse I connect to the database first and GET the $name, $email and $birthday from the url string. This works, but just adds the new row; Here’s what I tried; … Read more
Your version does not support that character set, I believe it was 5.5.3 that introduced it. You should upgrade your mysql to the version you used to export this file. The error is then quite clear: you set a certain character set in your code, but your mysql version does not support it, and therefore … Read more
you have enlosed start_date with single quote causing it to become string, use backtick instead SQLFiddle Demo
I would say that first and foremost: be consistent. I reckon you are almost there with the conventions that you have outlined in your question. A couple of comments though: Points 1 and 2 are good I reckon. Point 3 – sadly this is not always possible. Think about how you would cope with a … Read more
Check to see if your user is mapped to the DB you are trying to log into.
There is no such thing as “auto_increment” or “identity” columns in Oracle as of Oracle 11g. However, you can model it easily with a sequence and a trigger: Table definition: Trigger definition: UPDATE: IDENTITY column is now available on Oracle 12c: or specify starting and increment values, also preventing any insert into the identity column … Read more
Or just: In method syntax, with other operators: Essentially, you already are selecting all columns, the select then transforms that to the columns you care about, so you can even do things like:
I want the row with the single highest col3 for each (col1, col2) pair. That’s a groupwise maximum, one of the most commonly-asked SQL questions (since it seems like it should be easy, but actually it kind of isn’t). I often plump for a null-self-join: “Get the rows in the table for which no other … Read more
I’m guessing that Clients.Case_Number and/or Staff.Emp_ID are not exactly the same data type as Clients_has_Staff.Clients_Case_Number and Clients_has_Staff.Staff_Emp_ID. Perhaps the columns in the parent tables are INT UNSIGNED? They need to be exactly the same data type in both tables.
The proper way to do this is to use multiple tables and JOIN them in your queries. For example: The person_fruit table contains one row for each fruit a person is associated with and effectively links the person and fruits tables together, I.E. When you want to retrieve a person and all of their fruit … Read more