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MySQL Cannot Add Foreign Key Constraint
So I'm trying to add Foreign Key constraints to my database as a project requirement and it worked the first time or two on different tables, but I have two tables on which I get an error when trying to add the Foreign Key Constraints.
The error message that I get is:
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How to implement a ViewPager with different Fragments / Layouts
..., the viewpager created various fragments. I want to use different layouts for each fragment, but the problem is that viewpager shows only two layouts at the max (second layout on all of the remaining fragments after 1).
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How to implement WiX installer upgrade?
At work we use WiX for building installation packages. We want that installation of product X would result in uninstall of the previous version of that product on that machine.
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jquery change class name
...hange_me newClass');
Here's the full list of jQuery methods specifically for the class attribute.
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mysql update column with value from another table
...ed to change tableB.value according to tableA.value dynamically you can do for example:
UPDATE tableB
INNER JOIN tableA ON tableB.name = tableA.name
SET tableB.value = IF(tableA.value > 0, tableA.value, tableB.value)
WHERE tableA.name = 'Joe'
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SQL WHERE.. IN clause multiple columns
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Yeah, INNER JOIN would be more performant here. Doing a LEFT JOIN and filtering the nulls from table 2 is just a verbose way to use an INNER JOIN
– Pstr
Jul 30 '18 at 16:51
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How to concatenate strings of a string field in a PostgreSQL 'group by' query?
I am looking for a way to concatenate the strings of a field within a group by query. So for example, I have a table:
14 An...
Using regular expression in css?
I have an html page with divs that have id (s) of the form s1 , s2 and so on.
8 Answers
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How to put Google Maps V2 on a Fragment using ViewPager
...However, I can't implement google maps v2 on it. I searched the internet for hours already, but I can't find a tutorial on how to do it. Can some one please show me how?
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Making TextView scrollable on Android
...ires you to enter an arbitrary number; this isn't something that will work for every screen size and font size? I find it simpler to just wrap it with a ScrollView, meaning I don't have to add any further XML attributes or code (like setting the movement method).
– Christopher ...