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Questions tagged [count]

COUNT : an aggregate SQL function that is used to count the number of rows.

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1answer
32 views

How to query results from a huge postgres database?

I am trying to query a few tables in a 125GB Postgres database. I find a hard time getting the results back quickly! Even to find unique rows of a column it takes more than 10 minutes. Either I use a ...
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0answers
27 views

Aggregate function by date

I have a table of highscores achieved at tournaments. I select on highscores for each tournament using ID. (Each player can score more than one highscore in a tournament.) The query I have: SELECT m....
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5answers
944 views

SQL counting distinct over partition

I have a table with two columns, I want to count the distinct values on Col_B over (conditioned by) Col_A. MyTable Col_A | Col_B A | 1 A | 1 A | 2 A | 2 A | 2 A | 3 b | ...
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1answer
14 views

count and group_concat

I have data in a table like so: +---------+----------------------------------------------------+ | videoid | ips | +---------+---------------------------...
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1answer
16 views

Get the combined row count by month from 3 tables

Using Postgres 10+, I have three tables with similar structures, where I'm trying to get a count of rows grouped by months. I have a functional query working for two tables, as below: CREATE TABLE ...
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1answer
12 views

Join on unnested integer array column and count occurrences in array

I am trying to join two tables after I have unnested one of them. The tables are: CREATE TABLE teachers (id SERIAL, first_name VARCHAR(60), last_name VARCHAR(60)); CREATE TABLE training_modules (id ...
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0answers
52 views

How to get hit (number of possible results of a query) from a table with more than 100 million records in Postgres

We have a table X in postgres v11, where it has 5 columns like A B C D E. We all columns are indexed and there are all integer values. We have around, 100 milion records, but soon will turn into 800 ...
2
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2answers
43 views

SQL script to count rows for all views in a database with SELECT-only access

I need to know the row count for every view in a third-party database that I have been given SELECT-only access to. The following script works for tables but not views: SELECT SCHEMA_NAME(A....
2
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1answer
33 views

join table and count them SQL based on segment

I have 2 tables and I'm trying to join and count how many people have answer each questions. I'm trying to find a better way to have only two column. the first one will be of people who answer "Just ...
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0answers
21 views

Time wise user online count

I'm not a DB expert but i'm trying to get time wise user online count to show in a graph. I have manage to get online user count for current time but how to get for a time span ? i need each minute ...
2
votes
1answer
80 views

Improving performance of count where only result > 0 matters

I have following query: select count(*) -- rp.tag from submission inner join post rp on submission.id = rp.submission_id where user_name = ?1 and lower(rp.tag) like ('%verified%') and not lower(rp....
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2answers
49 views

Query is faster with additional JOIN

SELECT COUNT(DISTINCT User_id) FROM Session GROUP BY Floor_id; SELECT COUNT(DISTINCT User_id) FROM Session JOIN Floor ON Floor.id = Floor_id GROUP BY Floor_id; The second query runs 20x faster ...
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1answer
37 views

Calculating count on same table based on condition

So I need to calculate the amount of Clients who's LastName start with the same letter, then use that count as part of an Reference number. I.e. something like this: declare @...
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1answer
11 views

Help with optimizing Oracle Query - nested with count

I have 2 tables (Students and Cellphone). Columns in Students: StudentID, FNAME, PHONEID Columns in Cellphone: PhoneID, Phonename I want to create this: • Run a query to show the most popular ...
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3answers
60 views

SQL Join and Count

I have 3 tables in SQLServer that I want to join so I can count the number of times each SUBJ_NAME occurs for the ITEM_IDs in the LOAN table. CREATE TABLE SUBJT ( SUBJ_ID CHAR(4) PRIMARY KEY, ...
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2answers
37 views

Count results after filtering out

I am using MySQL 5.7 and need to count results after filtering out the data. My table structure: +----+---------+---------+---------+ | id | metakey | metaval | tour_id | +----+---------+---------+--...
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1answer
59 views

How to count records from different tables [closed]

So I'm trying to filter some records out of my select inside a form on my website. Problem is that I currently have this setup: Database Table1 time Number Table2 Number Something I'...
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2answers
34 views

For states (col) receiving exactly X number of items (row), sort the items by weight (col)

I have been trying to figure this out for a few hours now but haven't gotten it. Each row in the table is a package. I am able to get the States with the exact number of packages, but don't know how ...
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1answer
60 views

MySQL - Split results of count function into columns derived from a separate column

The title seems a bit confusing, but I am struggling to put down what I need this query to do so best to explain it. I have 3 tables in my database (Using MySQL Workbench), but for this query I'm just ...
1
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1answer
25 views

Count Assets Barcodes and Group by Rooms

I have 2 tables Asset Register and LocationRoom. I want to count the number of asset barcodes in each room. I want the output to be the list of Asset Barcodes, Description,RoomNo and count for ...
1
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2answers
70 views

If count >= row then insert row (substitute for variables and else/if)

I do 99% php/javascript work so getting my head around SQL is always a struggle, sorry if I seem dense. So I've got a table that looks something like this: post_id | meta_key | ...
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1answer
20 views

Issue with Maximo KPI Returning “0” Instead of a Calculated % [closed]

I am attempting create a KPI in Maximo that will count the work orders completed on time and divide it by the number of work orders due for the current month, then multiply it by 100 to return a ...
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1answer
22 views

Count Total Transaction each specific row even if 0

I have a 3 Columns namely: Payment Channel Payment Name Total Transaction The Total Transaction will be the COUNT of each Payment Channel and Payment Name. In the Payment Channel, values have PC01-...
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2answers
30 views

How to SELECT most common (viral) from a table and LIMIT results for pagination?

Sorry if it's a dubplicate but I can't find an answer to the question. Hello there so I have three tables users and articles and likes, a user can write an article, in the table articles there is ...
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1answer
17 views

Get count of value row

I'm trying to figure out what MySQL code would do the following. Count * from 'users' table (eg; 0,7 rows) then within the count get the count of 'money' based on the value of the user. I'm ...
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2answers
261 views

how to count distinct value per day with start time and end time

my title may seem a bit confusing but here's the context. I have a table 1. It contains the reference code per connection to SSID with value of start time. Now I have a scenario wherein the user ...
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1answer
48 views

Join 3 tables with where and sorting clauses

I have 3 tables, vendors, vendor_modelsand cameras. I am trying to get some values from db all of vendor_models but name from vendor too. Each camera has a reference of vendor_model as model_id. 10 ...
2
votes
1answer
56 views

Get total number of rows when offset is greater than max

I have a table users that has, say, 42 records. To get the total rows and some other details, I use a window function: select count(*) over() as count, name, id from users And since the consumer app ...
1
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2answers
52 views

Count items on condition

In an application where a user can have copies of a mobile application installed on multiple devices I'd like to know how many iphone and how many android apps each user has. I tried a query such as ...
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2answers
79 views

WHERE clause on a TIMESTAMP column causes serious performance penalty

I have a pages and a page_views tables with 100k~ & 4M~ records respectively. I run a query to get the top pages that have the most page_views: select `pages`.`id`, `pages`.`host`, `pages`.`...
1
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2answers
117 views

How can I count distinct columns inside a group?

I have the following query: SELECT DISTINCT name, surname, id_number, gender FROM table1; How do I filter by gender to get the gender breakdown of the results of the above query? Do I use a subquery?...
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1answer
50 views

How to get Average value from one row if have zero or null values in mysql

I'm new in mysql. I want to ask something about get average value from one row in mysql when have a null or zeros value on them. the image below assuming my table And I want to get the average from ...
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1answer
108 views

MySQL Subquery count

I need to find how many resources are available in depot when transit arrives. I need to have transit name and resource count on result. I'm using MySQL. I wrote this but it gives me error when adding ...
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1answer
20 views

Counting and grouping over multiple OUTER JOINs

I'm creating a view of advertisement logs (impressions, clicks, and clicks per impression). I have a simple table structure and some working queries but I'm having some trouble composing these into a ...
0
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1answer
34 views

mysql query to fetch group wise count

I am having mysql tables like below tbl_source_1 SRC_ID_1 | SOURCE_NAME_1 1 | ABC 2 | DEF 3 | GHI tbl_source_2 SRC_ID_2 | SOURCE_NAME_2 1 | NAME_1 2 | NAME_2 3 ...
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vote
2answers
250 views

How can I get the percentage of the table the groups represent?

Given a query like this, CREATE TABLE foo(grp) AS VALUES ('a'),('a'),('b'),('b'),('b'),('c'),('c'),('c'),('c'),('e'); I can use GROUP BY to aggregate into a,b,c,e, but how can I return the different ...
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1answer
42 views

JOIN tables and return count even if it is 0

I have this query: select settings.customer_id, current::jsonb->'alarms' as alarms, from settings join (select customer_id, current::jsonb->'alarms' as alarms from settings) as res on res....
1
vote
1answer
117 views

Count all rows for each DISTINCT

How can count all rows of WHERE statement: SELECT DISTINCT column1 FROM table COUNT WHERE date::text LIKE '%2014%'; My output: column1 ======= info1 info2 info3 Desired OUTPUT: column1|...
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0answers
110 views

MySQL count rows of multiple tables for each user

I basically need this with some adjustments, I just can't seem to figure it out how to do it. I need to sum the rows of two tables, for example: SELECT student.StudentID, student.`Name`, COUNT(...
2
votes
1answer
40 views

where clause after limiting results

I have a question about getting results after limiting the rows. I don't have much experience with MySQL, but I'm trying to get results from a database where I need to do the where clause after ...
0
votes
1answer
46 views

Efficient way to check for number of records more than a limit from a table in SQL Server

I came across queries that can most efficiently get the total sum of the records in the table. However, i want to group the records in a table by a column and check if the count of the records is ...
0
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2answers
47 views

Count all products (with qty > 0) group by all brands. But get aslo count zero for brand which have 0 products

I have table: brands brand_id name 1 Apple 2 Sony 3 Nokia 4 HTC products id brand_id qty 1 1 3 2 3 0 4 1 1 2 2 1 I need to ...
0
votes
1answer
36 views

Get two row counts from the same table [closed]

What I am trying to achieve is run both queries (below) at the same time. From one table rvsessions I need to get the count for the total amount of sessions(which is achieved by the number of times ...
0
votes
1answer
65 views

MySQL, would like to get both a field and a count inside GROUP_CONCAT

I can get a list of statuses that a tracking ticket has had, as well as the id of those statuses, as follows: SELECT t.id, t.name, GROUP_CONCAT( CONCAT(s.id, ':', s.name) ORDER BY s.id) AS ...
1
vote
2answers
85 views

SELECT i.c.w. a COUNT and INNER JOIN gives different results with string literals and numeric values when they are used in a WHERE clause

I have a MySQL query: SELECT p.informationProvider as pGLN, p.productID, p.productStatus FROM tblproducts AS p WHERE -- informationProvider is of type varchar(14) p....
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2answers
62 views

MySQL Query can we count rows using php to reduce time of count(*) in a query or there is no difference?

Having the following queries, where the first query is returning a field of number of rows found, and the second returns the actual rows: First Query: SELECT count(*) as total FROM individual i ...
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1answer
18 views

Counting entries of a unique entry of another field and concatenate the result with the unique field in a new column [closed]

I want to create a query that will search the table and find the following: If a POL_N entry has ENDO_N entries then the COUNT ENDO_N field will start counting the ENDO_N entries and will get the ...
0
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1answer
24 views

select data from related tables and display their counts in the relating table

I have a table which stores data about an inspection. Inspections are carried out in a particular company belonging to an industry, located in a region. the inspections table has the industry_id field ...
-1
votes
1answer
40 views

Count comma seperated values in mysql ORDER BY clause

I have a table name products: id - pro_name - ip - date_created 1 - abc1 - 27.106.121.23,27.106.121.86 - 2018-08-15 13:32:00 2 - ...
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2answers
75 views

Calculate ticket sales by using SUM in SELECT clause

In this ticketing setup on dbfiddle, I am trying to calculate the ticket sales for a particular event by multiplying the ticket price and the total number of tickets sold for that event, based on ...