postgresql

问题 I've simplified this down a bit since the literal data is pretty massive but a very simple example will suffice. I'm working on a query where because of the massive amount of data, I'm looking to do some aggregation in one shot instead of many many steps. I have two tables <<customers>> id | first_name | last_name 1 | Reed | Richards 2 | Johnny | Storm 3 | Peter | Parker <<purchases>> id | cid | date 1 | 1 | 2017-01-09 2 | 2 | 2017-01-09 3 | 2 | 2017-01-09 4 | 3 | 2017-01-09 When I run the

问题 In Windows 10 Pro 64-bit & new installation of PostgreSQL 9.4, attempting to connect to the server in pgAdmin III results in The service is running and the service name is correct, as seen here I am brand new to PostgreSQL, but fwiw, I've configured a working Symfony 2.7 application to use PostgreSQL and have successfully (according to the Symfony console) created a database and its schema. What is required to get pgAdmin to connect properly? 回答1: It turns out that the error message is

问题 In Windows 10 Pro 64-bit & new installation of PostgreSQL 9.4, attempting to connect to the server in pgAdmin III results in The service is running and the service name is correct, as seen here I am brand new to PostgreSQL, but fwiw, I've configured a working Symfony 2.7 application to use PostgreSQL and have successfully (according to the Symfony console) created a database and its schema. What is required to get pgAdmin to connect properly? 回答1: It turns out that the error message is

问题 I am a student. I am using AWS free tier account. I don't have money to pay for the resources. I have developed an application for the society. I don't want my website should face any downtime in production just because of the free service provided by Amazon.SO, can I go for the Dev/Test RDS for my production application? 回答1: The basic different between a Dev/Test configuration for Amazon RDS and a Production configuration is that the Production configuration has Multi-AZ activated. This

问题 I am a student. I am using AWS free tier account. I don't have money to pay for the resources. I have developed an application for the society. I don't want my website should face any downtime in production just because of the free service provided by Amazon.SO, can I go for the Dev/Test RDS for my production application? 回答1: The basic different between a Dev/Test configuration for Amazon RDS and a Production configuration is that the Production configuration has Multi-AZ activated. This

问题 Sorry for my bad English. I have a table in postgres like: CREATE TABLE report ( id serial primary key, sensor_id integer, datetime timestamp, ...(many other fields) ); Collection in mongo stores the same data. Index in Postgres (I created all of them and separatly, but result is the same) : create index report_datetime on report (datetime desc); create index report_sensor_datetime on report (datetime desc, sensor_id); create index report_sensor_datetime_1 on report (sensor_id, datetime desc)

问题 Sorry for my bad English. I have a table in postgres like: CREATE TABLE report ( id serial primary key, sensor_id integer, datetime timestamp, ...(many other fields) ); Collection in mongo stores the same data. Index in Postgres (I created all of them and separatly, but result is the same) : create index report_datetime on report (datetime desc); create index report_sensor_datetime on report (datetime desc, sensor_id); create index report_sensor_datetime_1 on report (sensor_id, datetime desc)

问题 The past two days I've been reading a lot about jsonb, full text search, gin index, trigram index and what not but I still can not find a definitive or at least a good enough answer on how to fastly search if a row of type JSONB contains certain string as a value. Since it's a search functionality the behavior should be like that of ILIKE What I have is: Table, lets call it app.table_1 which contains a lot of columns one of which is of type JSONB, so lets call it column_jsonb The data inside

问题 Is there any way to convert Postgres PATH type to an ARRAY in order to have index access to it's points? 回答1: There is no way to do that with PostgreSQL alone - you'd have to write your own C function. With the PostGIS extension, you can cast the path to geometry and perform the operation there: SELECT array_agg(CAST(geom AS point)) FROM st_dumppoints(CAST(some_path AS geometry)); 来源： https://stackoverflow.com/questions/60389921/postgres-convert-path-type-to-array

问题 Is there any way to convert Postgres PATH type to an ARRAY in order to have index access to it's points? 回答1: There is no way to do that with PostgreSQL alone - you'd have to write your own C function. With the PostGIS extension, you can cast the path to geometry and perform the operation there: SELECT array_agg(CAST(geom AS point)) FROM st_dumppoints(CAST(some_path AS geometry)); 来源： https://stackoverflow.com/questions/60389921/postgres-convert-path-type-to-array