I have this piece of code: but I have this error: Answer Since you commented out your print statement, your loop is now closing the connection (and all of its dependent resources). Your code, without the commented out line:
Tag: mysql
Why can’t I use a local variable after a SQL query in Node.js?
I have to select all tags available in the database, so I could use them in my function, but I can’t use the variable after I assigned a value to the variable in the callback function of the query, why? Code which is not working: However this works: but why? I want to use the variable tags after that qu…
MySQL join dataset on at least X items
My question in a SQL Fiddle. How can I join all elements in table A with all elements in table B via a many-to-many mapping table, even if no relationship exists? My LEFT JOIN solution isn’t giving the results I expect. Details: Given these tables: And this seed data: I need a report like this: The quer…
SQL pivot the column values
Problem Statement: Pivot the Occupation column in OCCUPATIONS so that each Name is sorted alphabetically and displayed underneath its corresponding Occupation. The output column headers should be Doctor, Professor, Singer, and Actor, respectively. Note: Print NULL when there are no more names corresponding to…
Timecard report that shows hours worked every day, even when its zero
############################################ The above query produces this: query results What I want is for the work_date column to show every date in the month. If someone doesn’t work then WO#, act_hours, phase#, and trans_no would all be null but the work_date field, shop, and employee # would still…
INSERT value by adding URL and file name
I want to to insert value into my single column with website URL and upload path. But I’m really don’t doing that. Here I have 2 columns into my table. And I want to insert the website URL and upload …
How to find duplicate records in MySQL, but with a degree of variance?
Assume I have the following table structure and data: I’d like to be able to find duplicate transactions where the description and amounts match, but the date would have some degree of variance +/- 3 days from each other. Because the “Burger King” transactions are within three days of each o…
Find the max value in the last digit
I am using MySQL 5.5. I am facing a problem on how to find the max value in the last digit. For example below the table, I want to get the max value is detected the last digit. The result should be …
How to implement LIKE functionality in a grouped query that depends on an IN operator? [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 2 years ago. Improve this question After some great interaction here in Stack Overflow I am able to implement queries to get al…
Is it possible to select all dishes that contain only ingredients A and B in one query?
I know you could achieve this by getting all dishes that contain A and B and then checking every dish in the results with a second query that counts how many ingredients each dish has. Then, if the …