I am working on an App connecting to the Snowflake database. I stumbled upon an issue while loading CSV files. I was using the NULL_IF condition in copy command to change column value to null if any empty value is encountered during the load On investigation, I came to know that one of the columns is part of the composite
Tag: primary-key
INSERT + SELECT data type mismatch on similar fields
I’m running the following SQLite workaround to add a primary key to a table that did not have one. I am getting a datatype mismatch on However, the fields have exactly the same type. Is it possible that his happens due to running the queries from DbBrowser for SQLite? Answer You have defined the column id of the table cities
Oracle error ORA-02270: no matching unique or primary key for this column-list
I got an error while creating this table. Here are the course and slide tables: What should I do ? Answer The foreign key should be in one definition, like this:
Foreign and Primary Key Conceptual Questions
I am a newbie at SQL/PostgreSQL, and I had a conceptual question about foreign keys and keys in general: Let’s say I have two tables: Table A and Table B. A has a bunch of columns, two of which are A.id, A.seq. The primary key is btree(A.id, A.seq) and it has a foreign key constraint that A.id references B.id. Note
Define Position based on lowest ID and Foreign Key in MySQL
I am currently facing the following issue: I have 1 Table with my Broker Trading Data similar to this: The Goal is to say IF first OrderType (lowest Id where TradeId is the same) was a Buy, it’s a LONG Trade ELSE a Short Trade … output should be like this: What am I missing? How can I construct my
When issuing a command to MySQL, I’m getting that error “#1075 – Incorrect table definition;”
CREATE TABLE onscreen( id int(2) not null AUTO_INCREMENT, subject varchar(100) not null, content varchar(100) not null, date datetime not null );
MYSQL no duplicate of 2 values
I couldn’t find an answer for this exact question although I am sure the information is on here somewhere. I have a python script that is adding stock data into a database. For each stock database has ~1000 lines where ‘ticker’ is the stock name and ‘time’ is the date(1 for each day). When I run my update script I
SQL : Select all column after a distinct count = 1
In sql, I am trying to do that : I have a (staging) table with let say 8 columns 4 of these column are primary key of main table in which I need to insert the data of staging table 1 column is the operation of the column (I for Insert, U for Update, D for Delete) 3 are the
Updating sequence for primary key in postgres for a table with a lot of deletions
I have the following problem: I have a table with a lot of deletions and inserts of rows. Also I would like to assign to each of current rows in tables some id number. Currently I’m trying to do it with But if I understand correctly, sequences are monotonous and can’t go down when i delete some rows, so i
What are the disadvantages when I use mutually dependent foreign keys?
I know that it’s not a good method to use two tables with mutual foreign key definitions, but I don’t understand the difficulties that arise in the database. An example: I’ve a table city and a table state. City.city points at state.capitalcity and state.state points at city.state. I would appreciate any help, thanks. Answer That’s fine. The problem arises when