Inserting in a table

INSERT INTO table_name (column1,column2, column3, ...)
VALUES (value1, value2, value3, ...);

Hey everyone ! Been a long since I posted anything. I realised that providing all the details here is meaningless as there are many better resources out there !
Keeping that in mind

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Find the Employees who hired in the Last n months. Write a SQL query for that.

Send your queries in the discussion group.

https://docs.microsoft.com/en-us/sql/t-sql/lesson-1-creating-database-objects?view=sql-server-ver15

Start your tutorial here

Write a sql query to find the second largest number from table table_name and column number.

Write a sql query to delete duplicate rows from a table.

Write a sql query to find the Joining date of Employee in YYYY-DAY-Date format.

You are given this database, your task is to output➡

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Here's a snippet of code written in C:

for(int i=0;i<n;i++)
{
 for(int j=0;j<n;j++)
{
//some operation
}
}

How can I write something equivalent in SQL?

Solution:Alias

say, you are asked to count the frequency of each color occurring in the same table , so you can write something like this:


select distinct color ,(select count(*) from colors where c.color=color) from colors c;

When assigning unique identifiers to rows based on a specified order, three key functions come into play: ROW_NUMBER, RANK, and DENSE_RANK.

Consider the following table:

| Name | Score |
|-------- |-------|
| Alice | 90 |
| Bob | 90 |
| Carol | 85 |
| David | 78 |


ROW_NUMBER:

The simplest of the three, ROW_NUMBER assigns a unique number to each row based on the specified order. Each row receives a distinct identifier, incrementing by one.
Example:

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2
3
4

RANK:

Assigns unique numbers, and in the case of ties, rows get the same rank, and the next rank is skipped.

1
1
3
4

DENSE_RANK:

Assigns ranks to rows with tied values, without skipping the next rank

1
1
2
3

These functions help in organizing and analyzing data by providing distinct identifiers or ranks based on specified criteria. The example table illustrates how ROW_NUMBER, RANK, and DENSE_RANK operate in assigning order to rows with varying scores.

(Note: This is 1/3 of the total number of articles; others are coming soon.)