I've created a column of usernames but the ids for each row is linked to another table. If a user is deleted, I'd like to change the username to 'Deleted'. So I'd like to allow for unique values except for…
I followed the floor documentation step by step. Entities, Dao, Converters and database have been created. Build_generator generated the model.g.dart files type but not the database.g.dart file. I encounter two errors: Could not generate `fromJson` code for `changeListener`. To support…
I have faced this scenario in one of my interview. There will one table with millions of records and the table is going to have only two columns id which is primary key and time_stamp which is of type date…
I'm making a copy of an nft website for practice and I'm getting an error when transferring data from one table to another in my postgresql database using python. sender table: collection_stats receiving table: tbl_general_assets ` import psycopg2 db_config =…
I have chat, admin,user and message entities. chat has reference of user and admin, message has reference on chat. Message has boolean property called viewed. So I am trying to get chats for admin with user data populated and the…
So far, in my experience, I have seen pgbouncer used in a multi-client, single DBMS, single DB scenario: i.e. many hosts, running the same application, connect to the same db on a single DBMS host, and pgbouncer helps to reduce…
I have a set of sql statements, CREATE TABLE PRICING( CodeVillage INT, TypeCabin INT, CodeSeason CHAR(2), WeekPrice INT, PRIMARY KEY(CodeVillage, TypeCabin, CodeSeason) ); CREATE TABLE SEASON( CodeSeason CHAR(2) PRIMARY KEY, NameSeason VARCHAR(20), CONSTRAINT Fk_Pricing_CodeSeason Foreign KEY (CodeSeason) REFERENCES PRICING(CodeSeason) );…
I'm working on an Login app On the login screen, there are three TextFields: user number, password, and company code(= database name) When login, enter userID, password, and company code(= database name) and click the login button I want to…
i am trying to use chunk method in laravel to show my data in the blade but I get it empty here is my code $accounts = Acc_account::where('cat', 2)->chunk(200, function (account) { foreach ($accounts as $account) { // } });…
How to delete duplicate data in mySql on new version? SchoolId StudentName 101 Majid Bhuiyan 101 Majid Bhuiyan 102 Arif 103 Tamim Rahman 104 Sourov Doggesh I expect it mySql code. How to delete only one row in that duplicate…