Lab Sql

I have a table containing each a start and and end date: DROP TABLE temp_period; CREATE TABLE publ… Read more Exclude Overlapping Periods In Time Aggregate Function

I am a digital marketing manager and am trying to breakdown my campaigns for sliced analysis. My ca… Read more "split_part" To Structure A Column Into A Table?

I have the following data: ID CLASS VALUE 1 NHB 700905.7243 1 HBW 164216.1311 1 HBO… Read more Postgresql Says "return And Sql Tuple Descriptions Are Incompatible"

I am looking to identify return visitors to a website within a 7 day window. A data sample and atte… Read more Postgresql: Identifying Return Visitors Based On Date - Joins Or Window Functions?

I have two tables p and u as following: (PostgreSQL 9.3) CREATE TABLE p ( pid integer NOT NULL, … Read more How To Delete Record When There Is A Deadlock Of Foreign Keys?

I am new to Postgresql and I am using version 9.3. I have a table in which i have a couple of rows.… Read more Postgresql: Row Number Changes On Update

I'm trying to delete a child object from a many-to-many relationship in sql-alchemy. I keep get… Read more Deleting From Many-to-many Sql-alchemy And Postgresql

I have this array from a json object: [1, 9, 12] Since it uses the square bracket notation because … Read more How To Turn A Simple Json(b) Int Array Into An Integer[] In Postgresql 9.4+

I have many records which my simple query returning but when i use function it just gives me first … Read more Postgres Function Returning One Record While I Have Many Records?

I have a query : SELECT distinct(a0.ID,a0.str) from sev_modul_4_type1 as a0 where ((lower(a0.str… Read more Alias With Order By

Here is the code I use in a Ruby on Rails project to find residences which have amenities with the … Read more Get The Count Of Rows Count After Group By

Working with PostgreSQL 9.6.3. I am new to functions in databases. Let's say there are multiple… Read more Pass Table Name Used In From To Function Automatically?

This might be simple but I'm new to SQL and couldn't find how to do this exactly. I have fo… Read more Sql - Postgres - Return Maximum Value For Latest Date

I have a query like this: select foo.*, count(bar.id) from foo inner join bar on foo.id = bar.foo_i… Read more Why No "select Foo.* ... Group By Foo.id" In Postgres?

I'm working on a Ruby app which uses the mysql functions XOR (^) and BIT_COUNT(). However I now… Read more Translate This Mysql Query To Pygresql

I have 3 tables: doctors (id, name) -> has_many: patients (id, doctor_id, name) -> has_ma… Read more Sql Selecting Average Score Over Range Of Dates

The title of this question is not accurate but I didn't know how to summarize it. Please feel f… Read more Merge Tables With Postgresql

I have a column with numeric[] values which all have the same size. I'd like to take their elem… Read more Vector (array) Addition In Postgres

This is a question asked here before more than once, however I couldn't find what I was looking… Read more Sql Joined By Last Date

I'm not sure if its standard SQL: INSERT INTO tblA (SELECT id, time FROM tblB WHE… Read more Postgresql: Insert Into ... (select * ...)