subtraction

I would like to do an update by doing a simple addition on Sequelize. table: id || data 1 || 10 sample: db.table.update({ data : 1 }, { where: { id: 1 }}); after this query id || data 1 || 11 I know it's a simple question, but I could not find the solution. Which operator can I add and subtract? Thank you Here it is : db.table.update({ field: Sequelize.literal('data + 1') }, { where: { id: 1 }})) OR User.findById(1).then(user => { // -----> First Way return user.increment('my-integer-field', {by: 2}); // -----> Second Way return user.increment([ 'my-integer-field', 'my-very-other-field' ], {by

I have a table with three columns: taxon_id , scientific_name_element_id , and parent_id . I want to find the elements that are children and not parents, so the termini of the structure. I found some sources that suggested that I use select taxon_id from taxon_name_element where taxon_id not in (select parent_id from taxon_name_element) But this does not work, I get an empty set when I can actually browse the entries and see that there is, for example, a taxon_id=1 , and NO parent_id=1 Conversely when I see what taxon_id's are in parent_id's I get a nonempty result set What am I doing wrong?

I have successfully implemented a shunting yard algorithm in java. The algorithm itself was simple however I am having trouble with the tokenizer. Currently the algorithm works with everything I want excluding one thing. How can I tell the difference between subtraction(-) and negative (-) such as 4-3 is subtraction but -4+3 is negative I now know how to find out when it should be a negative and when it should be a minus, but where in the algorithm should it be placed because if you use it like a function it wont always work for example 3 + 4 * 2 / -( 1 − 5 ) ^ 2 ^ 3 when 1-5 becomes -4 it

I have 2 queries in MS SQL that return a number of results using the COUNT function. I can run the the first query and get the first result and then run the other one to get the other result, subtract them and find the results; however is there a way to combine all 3 functions and get 1 overall result As in: run sql1 run sql2 run SQL3 (sql1-sql2)?.... I tried them with xxxx as a function but no luck. You should be able to use subqueries for that: SELECT (SELECT COUNT(*) FROM ... WHERE ...) - (SELECT COUNT(*) FROM ... WHERE ...) AS Difference Just tested it: Difference ----------- 45 (1 row(s)

There are two unsigned ints (x and y) that need to be subtracted. x is always larger than y. However, both x and y can wrap around; for example, if they were both bytes, after 0xff comes 0x00. The problem case is if x wraps around, while y does not. Now x appears to be smaller than y. Luckily, x will not wrap around twice (only once is guaranteed). Assuming bytes, x has wrapped and is now 0x2, whereas y has not and is 0xFE. The right answer of x - y is supposed to be 0x4. Maybe, ( x > y) ? (x-y) : (x+0xff-y); But I think there is another way, something involving 2s compliment?, and in this

I'm trying to subtract one month from 2015-12-31 but it gives me 2015-12-01 instead of 2015-11-30 . Why ? Code: var date1 = new Date('2015-12-31'); var date2 = new Date(date1); date2.setMonth(date1.getMonth() - 1); console.log(date1); console.log(date2); Output: Thu Dec 31 2015 01:00:00 GMT+0100 (CET) Tue Dec 01 2015 01:00:00 GMT+0100 (CET) Any workaround? Try this var date1 = new Date('2015-12-31'); var date2 = new Date(date1); date2.setDate(date2.getDate()-date1.getDate()); alert(date2) When subtracting months, you can check whether the day of the adjusted Date is different to the day of the

I have an array with keys and values. Each value is an integer. I have an other array with the same keys. How can I subtract all of the values for the matching keys? Also there might be keys that do not occur in the second array but both arrays have the same length. If there is a key in array 2 that is not present in array 1 its value should be unchanged. If there is a key in the first array that is not in the second it should be thrown away. How do I do it? Is there any built-in function for this? If I would write a script it would be some kind of for loop like this: $arr1 = array('a' => 1,

Suppose that A and B are signed positive integers, then for A-B , it's calculated using A+2 's complement of B . For example, in a 4-bit binary system, for signed integers, we have 7-3=0111-0011=0111+1101=(1)0100 , the 1 in the bracket is the carry bit. According to the overflow rule for signed integer, we know there is no overflow and the result is therefore correct. However, for unsigned integers, what will happen if we calculate 7-3 ? If we use the same way we mentioned above: 7-3=0111-0011=0111+1101=(1)0100 then, according to the overflow rule for unsigned integers, there is an overflow

ok, i need my code to check if minus/subtract/- was pressed, if it was pressed i want an alert box to pop. i tried with both 109 and 189 key codes but i still don't get the desired result. although i press "-" i don't get that alert box The JavaScript charCodes , which you test for during a keypress event, are ASCII . 109 is the correct keyCode , if used in a keydown or keyup event. "-" has a charCode of 45. Don't do this in a keydown event handler - you put yourself at the mercy of different browsers' ideas about key codes and potential variation between key codes for different keyboard types