Useful tips for everyday
How to count columns with the same ID? You need to count the value of the column value for each id: select t.id, (select count…
Can I left join a select statement? The LEFT JOIN allows you to query data from two or more tables. Similar to the INNER JOIN…
How do I share a wired Ethernet connection with all devices? Buy a “USB Ethernet adapter” or similar product, which will take an Ethernet cable…
Is phone a machine? Machine – an apparatus using or applying mechanical power and having several parts, each with a definite function and together performing…
How to create an object using the COM API? Details on creating objects using the COM API can be found in the dedicated page. To…
What is the closed unit ball? A unit ball (open or closed) is a ball of radius 1. A subset of a metric space is…
Why are the corners of my 3D print lifting? Warping occurs due to material shrinkage while 3D printing, which causes the corners of the print…
How do I show subcategories on a category page in WordPress? $this_category = wp_list_categories(‘orderby=id&depth=1&show_count=0&title_li=&use_desc_for_title=1&child_of=’. $this_category->cat_ID. How do I find the subcategory of a parent category…
How do I access a shared iTunes library on my Mac? Set up Home Sharing on your Mac Choose Apple menu > System Preferences.…
How do you write a function in pseudocode? Five concepts are: Use a beginning phrase word to start the function. Use a communication phrase word…