How can I improve this query for speed? at the moment it’s taking a couple of seconds only to load the php file where the query is without even querying anything. I’ve an index on skillsTrends, jobtitle and industry. Collation: utf8mb4_unicode_ci Number of records < 1,000,000. Answer Try this covering index. It should help the performance of your query. And,
Tag: count
How to create new count column based on adjacent combinations in existing table
I have a simple table I’ve already built in BigQuery and all I want to do is what feels like a simple count of the number of times the combination of the person_id and the specific activity in the activity column has appeared in that table and create as a new column with a value/count of the adjacent combination in
SQL: How to divide column by counts?
So I have this query This will print something like device_id paper_count 1 5000 2 10000 And I have this other other query that will return the number of times the toner has been changed according to some date. I used count to count the number of times it’s been changed. This will print something like device_id Change Count 1
How to use multiple count distinct in the same query with other columns in Druid SQL?
I’m trying to use three projections in same query like below in a Druid environment: But instead I get an error saying – Unknown exception / Cannot build plan for query It seems to work perfectly fine when I put just one count(distinct) in the query. How can this be resolved? Answer As the Druid documentation points out: COUNT(DISTINCT expr)
COUNT to return NULL as 0 in same table in SAS PROC SQL with GROUP BY
I am having a task where I have 1 table. There is a unique ID for transactions, transaction dates, and store names. My task would be to count the number of transactions every store made during March. This, in itself, is simple: This would lead to a table where a store is present only if it had a transaction in
How to count a foreign key and use it to sort the primary table?
I have 2 tables: Product (prod_id, prod_name, vend_id) Vendor (vend_id, vend_name, vend_state) I am trying to make a query that will give me a list of the vend_name for every vendor that supplied only one product. vend_id is a foreign key in Product, and I would like to count how many instances of each vend_id are in Product and then
How to add data to a field based on other fields in a SQL database
I have an SQLite table called wcvp constructed from a csv file downloaded from the World Check List of Vascular Plants (see https://wcvp.science.kew.org/ and http://sftp.kew.org/pub/data-repositories/WCVP/). When I run this query: I get this result: kew_id genus species infraspecies 304293-2 Quercus robur 77189540-1 Quercus robur broteroana 77189379-1 Quercus robur brutia 77189383-1 Quercus robur imeretina 60459295-2 Quercus robur pedunculiflo 77171868-1 Quercus robur
Subquery to get derived value
I have the below table T in MySQL, with columns A and B. I want to query this table to get a value ‘C’, that has the count of the number of times the value in Column ‘A’ appears in Column ‘B’. For example, 1 appears 2 times in Column B, so the first row of column C should be
How to count the number of entries in the list when requesting Select?
I apologize for the possible incorrectness in the presentation, I use a translator. Let’s say there is a users table in which there is an id field. And there is a list that lists the id numbers and some of them are repeated. My query returns the following 3 – 1, 10 – 1. And I would like to get
SUM aggregation do not work on empty subqueries with DRUID
Assuming I am executing the following two queries on Druid: I tried to combine both counts in one single query with a sum aggregation like the following: And it works well UNLESS one of the two counts returns 0 rows. In that case I receive a Query returned no data message and I don’t have any final result from the