Get the rows from a table filtered by current month in psql. Example table – After query result, assuming current month is July, 2020: Answer The usual approach is to use a range query to allow for an index usage on registration_date
Tag: postgresql
additional condition in a SQL query with min(Date)
I have the code presented below provided to me by one of the members but I do not understand how it acts: The code extracts the min of start from another table. I wanna add an aditional condition like: I cannot insert the condition without an error. Also, I need only to see min(pr.”AsigStart”) fro…
PostgreSQL Query To Obtain Value that Occurs more than once in 12 months
I have the following query to return the number of users that booked a flight at least twice, but I need to identify those which have booked a flight more than once in the range of 12 months SELECT …
Double quotes problems with Postgres
I am using Django with postgres. Here’s the snippet of my code which I am using to create tables in the db. My question is: why is the user table getting renamed as “user” (with quotes) why is the role_id getting named as role_id_id where as I have clearly mentioned role_id to be my column n…
Update the timestamp values in a column so that the latest timestamp is current time while maintaining the relative time difference between rows
I have a table in a Postgres database with a column whose values are timestamps for a period of time in the past. How can I update the values in that column so the highest value (the most recent timestamp) is the current timestamp, keeping the same interval between the other ones? For example, if the current …
Group rows on condition PostgreSQL
I have a table with repeated Column1 and Column2 pairs, let’s say this is ‘many-to-many’ table. Also, I have there one extra integer column – Column3. What I want is select conditionally grouped rows, like 1). If pair of Column1 and Column2 have several records contains 5 value among o…
SQL – concatenate values in columns but keep only first non-null value
I have the following table in Postgresql. The first 4 records are the base data and the others were generated with the ROLLUP function. I want to add a column “grp_1” that will display the first non-null value of the columns grp1_l1, grp2_l2 and grp2_l3 I can get to the desired result by nesting 3…
Find first N rows that have unique value with mod(id, N)
For example, N is 10 and a table looks like id 1 2 3 4 5 6 7 10 11 12 13 108 109 111 112 113 Need to find first N rows that have unique value with mod(id, N). Expected result is mod10 1 2 3 4 5 6 7 …
SQL how to find continuous count of rows that exceed a value over time
I need to figure out how to query this table such that I find out the continuous count for each ID in which the value is equal or above 1 and the timestamp1 is bigger than timestamp 2. So for example: ID 1 will have a count of 2 because the 3rd row is 0 and even though the 4th
postgresql: relation “table_name” does not exist when trying to CREATE TABLE
I am running this code thru pgAdmin4: i am keep getting this message: ERROR: relation “supplier” does not exist SQL state: 42P01 The problem is with the foreign key in the product table (1st table), i know this because i removed it and it created all the tables with values (i removed some of the v…