postgresql

问题 I have the following three variables passed to the query A,B and C . A, B and C can take any values including null. When I run the below queryset, it should ignore the condition if the value in A,B or C is null queryset = User.objects.values().filter(A_name=A, B_name=B, C_name =C) For example, if C value passed in null then the query should behave like queryset = User.objects.values().filter(A_name=A, B_name=B) And if C and A value passed in null then the query should behave like queryset =

问题 I'm creating a web application to search people with their properties such as education, experience, etc. I can't use full-text-search for all the fields, because, some has to be a fuzzy match. (Eg: if we search for biotech, it should pick bio tech, biotech and also bio-tech). My database has about 200 entries in the profile model, which is to appear in the search results. Other models like education and experience are connected to profile through foreign key Therefore, I decided to be

问题 I am using node-postgres to write a web app backend, and I am running into this error: error: could not determine data type of parameter $1 at Connection.parseE (/home/***/niche-api/node/node_modules/pg/lib/connection.js:539:11) at Connection.parseMessage (/home/***/niche-api/node/node_modules/pg/lib/connection.js:366:17) at Socket.<anonymous> (/home/***/niche-api/node/node_modules/pg/lib/connection.js:105:22) at emitOne (events.js:96:13) at Socket.emit (events.js:188:7) at readableAddChunk (

问题 I'm new to Python and Django. I've purchased a book, Django 3 by example (3rd Edition) and really enjoying the lessons. I'm in chapter 3 now and the goal is to enhance the search engine functionality. In order to do so, the book has steps to convert the DB to PostgreSQL. I'm following the directions below and I've tried several things to fix the issue that I've found on Google. I can't seem to find the answer. Steps: install PostgreSQL: sudo apt-get install postgresql postgresql-contrib

问题 I'm new to Python and Django. I've purchased a book, Django 3 by example (3rd Edition) and really enjoying the lessons. I'm in chapter 3 now and the goal is to enhance the search engine functionality. In order to do so, the book has steps to convert the DB to PostgreSQL. I'm following the directions below and I've tried several things to fix the issue that I've found on Google. I can't seem to find the answer. Steps: install PostgreSQL: sudo apt-get install postgresql postgresql-contrib

问题 I have a query to generate a report based on a date series that is grouped by date and employee_id . The date should be based on a particular time zone, in this case 'Asia/Kuala_Lumpur'. But this can change depending on where the user's time zone is. SELECT d::date AT TIME ZONE 'Asia/Kuala_Lumpur' AS created_date, e.id, e.name, e.division_id, ARRAY_AGG( a.id ) as rows, MIN(a.created_at) FILTER (WHERE a.activity_type = 1) as min_time_in, MAX(a.created_at) FILTER (WHERE a.activity_type = 2) as

问题 I have a query to generate a report based on a date series that is grouped by date and employee_id . The date should be based on a particular time zone, in this case 'Asia/Kuala_Lumpur'. But this can change depending on where the user's time zone is. SELECT d::date AT TIME ZONE 'Asia/Kuala_Lumpur' AS created_date, e.id, e.name, e.division_id, ARRAY_AGG( a.id ) as rows, MIN(a.created_at) FILTER (WHERE a.activity_type = 1) as min_time_in, MAX(a.created_at) FILTER (WHERE a.activity_type = 2) as

问题 I have a query to generate a report based on a date series that is grouped by date and employee_id . The date should be based on a particular time zone, in this case 'Asia/Kuala_Lumpur'. But this can change depending on where the user's time zone is. SELECT d::date AT TIME ZONE 'Asia/Kuala_Lumpur' AS created_date, e.id, e.name, e.division_id, ARRAY_AGG( a.id ) as rows, MIN(a.created_at) FILTER (WHERE a.activity_type = 1) as min_time_in, MAX(a.created_at) FILTER (WHERE a.activity_type = 2) as

问题 I have a query to generate a report based on a date series that is grouped by date and employee_id . The date should be based on a particular time zone, in this case 'Asia/Kuala_Lumpur'. But this can change depending on where the user's time zone is. SELECT d::date AT TIME ZONE 'Asia/Kuala_Lumpur' AS created_date, e.id, e.name, e.division_id, ARRAY_AGG( a.id ) as rows, MIN(a.created_at) FILTER (WHERE a.activity_type = 1) as min_time_in, MAX(a.created_at) FILTER (WHERE a.activity_type = 2) as

问题 I'm creating a few tables in pgAdmin 4, but I keep getting the error it the title for some reason, can you spot why? I don't see any problem and i've looked into other code samples similar to mine which compiled perfectely. It also runs OK in IDEone (http://ideone.com/ZBn2Nr). thanks! Create table item (iname varchar(30) primary key, itype varchar(30)); Create table Cafe (license numeric(5,0) primary key, cname varchar(30), address varchar(30)); Create table Client (cid numeric(5,0) primary