How does one query a database? [closed] - sql

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How does one get the first name info from a Users table, which has a first name column?

First of all welcome to the community. I suggest you read the guidelines on how to properly ask a question here and you might want to write a title that is relevant to your question.
Now to the question:
Assuming tblUsers is a table in your database and 'first_name' is a column in your table, you can use SELECT followed by the column you want to select.
Lastly, add FROM to select which table you want to select from.
So in your case it would be:
SELECT first_name FROM tblUsers;
You can read more about SELECT here

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Is there a faster way to add new column data with hundreds of rows? [closed]

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I have a decent-sized table 'countries' with about 10 columns. I recently added a new column to the table 'GDP' and I am entering the information per row using
UPDATE countries
SET GDP=(value)
WHERE name = (country);
I have 200 countries in this table. Is there a better way to update this information?
This project is from Khan Academy. We are asked to select a database and run queries on it. The data was pulled from https://gist.github.com/pamelafox/ad4f6abbaac0a48aa781
I am just making sure that there isn't a more efficient way of adding this information to the existing table 'countries' where the primary key is the name of the country.

How to compare data in SQL [closed]

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I have an application which is taking data from questionnaires users are completing on a website and inputting this into a SQL Lite database.
I'm using Django and would like to display data of users who match closest by selecting similar answers.
How could this be done?
You can add multiple join conditions like this
SELECT *
FROM <table>
INNER JOIN <same table different name>
ON (condition1 OR condition2 OR condition3)

In Oracle SQL, how do I find where a column may be referenced using just queries? [closed]

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I have a specific column, called DELIVER_TO_LOCATION_ID , which is in a table called apps.po_requisition_lines_all
I need to dig into the database and derive the continent from the DELIVER_TO_LOCATION_ID ,
In SQL Developer I can't seem to find a way to do this .
any tips appreciated. thanks
You can use following command-
desc tableName
It'll give you description of table including every column in it having any constraints on it or not like primary key, reference key etc.

SQL Server 2008 Replace substring [closed]

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I have a Screen table which has name and display_name columns. I am trying to replace the word Lawfirm with Law Firm in name and display_name columns for all the records of Screen table.
My SQL experience is pretty premature, I am wondering is there a way to achieve this using a SQL script?
Yes, you can do this:
update screen
set display_name = replace(display_name, 'Lawfirm', 'Law Firm')
where display_name like '%Lawfirm%';

Describe table SQL Oracle [closed]

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How to describe table in SQL Oracle, I tried desc and describe, but it says desc not supported. I also tried mysql syntax show columns from table, but show is also unsupported?
You don't say what UI you are using, but DESC works in all of them that I know of. If it doesn't
SELECT * FROM ALL_TAB_COLUMNS
WHERE TABLE_NAME = 'MY_TABLE'
AND OWNER = 'MY_SCHEMA';
is an alternative for getting the same information.