Notes/fundamentals
1
0
Fork 0
mirror of https://github.com/robindhole/fundamentals.git synced 2025-03-15 22:59:53 +00:00
Code Issues Packages Projects Releases Wiki Activity

Merge branch 'master' of github.com:kanmaytacker/fundamentals

Browse Source
This commit is contained in:
Tanmay 2022-08-10 19:44:53 +01:00
commit a5754c9e70
4 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
database/README.md
View File

@ -23,7 +23,7 @@ Download the ER diagram from [here](media/student-er.drawio) and import it into
### Problem sets ### Problem sets
1. [**Simple - I**](https://leetcode.com/problems/big-countries/) 1. [**Simple - I**](https://leetcode.com/problems/big-countries/)
2. [Simple - II](https://leetcode.com/problems/find-customer-referee//) 2. [Simple - II](https://leetcode.com/problems/find-customer-referee/)
3. [**Joins - I**](https://leetcode.com/problems/employees-earning-more-than-their-managers/) 3. [**Joins - I**](https://leetcode.com/problems/employees-earning-more-than-their-managers/)
4. [Joins - II](https://leetcode.com/problems/combine-two-tables/) 4. [Joins - II](https://leetcode.com/problems/combine-two-tables/)
5. [**Aggregation - I**](https://leetcode.com/problems/duplicate-emails/) 5. [**Aggregation - I**](https://leetcode.com/problems/duplicate-emails/)

12
database/notes/05-sql-primer-worksheet.md
View File

@ -2,12 +2,12 @@
# Queries # Queries
## Insert queries ## Insert queries
1. Insert a row with your name and all the other fields 1. Insert a row with your name and all the other fields in **students** table
```sql ```sql
``` ```
1. Insert a row with just mandatory fields 2. Insert a row with just mandatory fields in **students** table
```sql ```sql
``` ```
@ -87,7 +87,7 @@
```sql ```sql
``` ```
15. Get all students without the first name `John` or last name `Mycroft` 15. Get all students without the first name `John` or first name `Mycroft`
```sql ```sql
@ -111,7 +111,7 @@
```sql ```sql
``` ```
20. Get all students in Jhansi and London 20. Get all students from Jhansi and London
```sql ```sql
@ -172,7 +172,7 @@
``` ```
2. Delete a multiple rows 2. Delete multiple rows
```sql ```sql
@ -188,4 +188,4 @@
2. Get first name and last name of all students and their instructor names 2. Get first name and last name of all students and their instructor names
```sql ```sql
``` ```

4
database/notes/05-sql-primer.md
View File

@ -211,5 +211,5 @@ For example, we want to get the batch names of all the students along with their
This can be achieved by using the following SQL query: This can be achieved by using the following SQL query:
```sql ```sql
SELECT s.first_name, s.last_name, b.batch_name FROM students s JOIN batches ON s.batch_id = b.id; SELECT s.first_name, s.last_name, b.batch_name FROM students s JOIN batches b ON s.batch_id = b.id;
``` ```

2
database/notes/06-sql-joins-aggregation.md
View File

@ -33,7 +33,7 @@ For example, we want to get the batch names of all the students along with their
This can be achieved by using the following SQL query: This can be achieved by using the following SQL query:
```sql ```sql
SELECT s.first_name, s.last_name, b.batch_name FROM students s JOIN batches ON s.batch_id = b.id; SELECT s.first_name, s.last_name, b.batch_name FROM students s JOIN batches b ON s.batch_id = b.id;
``` ```
### Left Outer Join ### Left Outer Join