Editings

ABOUT.md

@@ -0,0 +1,15 @@
+As developers, we all know the importance of automating repetitive tasks. Not only does it save time and effort, but it also eliminates the possibility of human error. One area where automation can be particularly useful is in database management.
+
+Recently, we explored how to automate various database tasks using Python and MySQL. We started by checking for the existence of a database named "spj", and if it existed, we dropped it and then created a new one with the same name.
+
+We then inserted multiple rows of data into the tables named "supplier", "shipment", "project", and "part" using the mysql-connector-python package and the INSERT INTO statement. The data was taken from text files saved in the same directory, with rows separated by a new line and column data separated by whitespace in the text files.
+
+However, when we tried to truncate the parent table, we encountered an issue as the "shipment" table had foreign key constraints referencing the primary keys of the other tables. To solve this, we deleted the foreign key constraints referencing the primary keys of the other tables and then truncated the "shipment" table.
+
+In addition to the basic CRUD operations, we have also seen how to handle the foreign key constraints while truncating the tables and how to handle the case where the database does not exist.
+
+By using tools like Python and MySQL, as well as libraries such as sqlalchemy, developers can easily create, modify, and query databases, as well as insert and manipulate data, and handle various database related tasks.
+
+In order to be an effective developer, it's important to have a good understanding of database management and the tools available. By staying up-to-date with the latest developments in the field and experimenting with different tools and techniques, developers can continue to improve their skills and become more efficient at managing databases.
+
+Don't wait, start automating your database tasks today, and see the difference for yourself!

README.md

@@ -1,15 +1,13 @@
-As developers, we all know the importance of automating repetitive tasks. Not only does it save time and effort, but it also eliminates the possibility of human error. One area where automation can be particularly useful is in database management.
+# Supplier-SQL
 
-Recently, we explored how to automate various database tasks using Python and MySQL. We started by checking for the existence of a database named "spj", and if it existed, we dropped it and then created a new one with the same name.
+Read about this repository [here](ABOUT.md).
 
-We then inserted multiple rows of data into the tables named "supplier", "shipment", "project", and "part" using the mysql-connector-python package and the INSERT INTO statement. The data was taken from text files saved in the same directory, with rows separated by a new line and column data separated by whitespace in the text files.
+### Start working with the project
+1. Clone this repository by `git clone https://github.com/huzefamehidpurwala/Supplier-Python-SQL.git`.
+2. After successfully cloning the repository change directory by `cd Supplier-Python-SQL`.
+3. Create virtual environment for the project by `python3 -m venv Supplier-Python-SQL_venv`.
+4. Activate the environment:
+   - for windows `Supplier-Python-SQL_venv\Scripts\activate`
+   - for linux `Supplier-Python-SQL_venv/bin/activate`
 
-However, when we tried to truncate the parent table, we encountered an issue as the "shipment" table had foreign key constraints referencing the primary keys of the other tables. To solve this, we deleted the foreign key constraints referencing the primary keys of the other tables and then truncated the "shipment" table.
-
-In addition to the basic CRUD operations, we have also seen how to handle the foreign key constraints while truncating the tables and how to handle the case where the database does not exist.
-
-By using tools like Python and MySQL, as well as libraries such as sqlalchemy, developers can easily create, modify, and query databases, as well as insert and manipulate data, and handle various database related tasks.
-
-In order to be an effective developer, it's important to have a good understanding of database management and the tools available. By staying up-to-date with the latest developments in the field and experimenting with different tools and techniques, developers can continue to improve their skills and become more efficient at managing databases.
-
-Don't wait, start automating your database tasks today, and see the difference for yourself!
+***Still work going on...! Stay tuned!*** 🎁

commands.sql

@@ -32,4 +32,4 @@ create table shipment (
     foreign key (SNO) references supplier(SNO),
     foreign key (PNO) references part(PNO),
     foreign key (JNO) references project(JNO)
-);
+);

questions-solutions.sql

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+-- Comments: "-- " and "/*___*/"
+
+USE spj; -- "use" is used to select database.
+-- ==== Query questions ==== --
+
+-- 1. Get Full details of all projects.
+SELECT * FROM project; -- "select" query is used to select or fetch data from the particular database.table
+
+-- 2. Get Full details of all projects in London.
+SELECT * FROM project
+         WHERE CITY="LONDON"; -- "where" is used to filter records returned by select.
+
+-- 3. Get supplier numbers for suppliers who supply projects J1.
+SELECT SNO FROM shipment
+           WHERE JNO="J1";
+
+-- 4. Get all shipments where the quantity is in the range 300 to 750 inclusive.
+SELECT * FROM shipment
+         WHERE QTY BETWEEN 300 AND 750; -- "between" operator selects values within a given range.
+                                        -- AND, OR, and NOT are logical operators
+
+/* 5. Get all part-color/part-city pairs.
+   Note : Here and subsequently, the terms “all” means “all currently represented in the database, “ not “all possible”
+*/
+SELECT CONCAT_WS("-", PNAME, COLOR) AS "part-color",
+       CONCAT_WS("-", PNAME, CITY) AS "part-city" FROM part;
+-- or
+SELECT CONCAT_WS("\t",
+    CONCAT(PNAME, "-", COLOR),
+    CONCAT(PNAME, "-", CITY)
+    ) AS columnName FROM part;
+-- "concat" function is used concatenate strings (outputs)
+-- "concat_ws" function is used to concatenate strings (outputs) with a specified character.
+-- "as" is used to give alias (a temporary name)
+
+/* 6 Get all supplier -number/part- number/project- number triples such that the indicated supplier, part and
+    project are all collocated (i.e. all in the same city). */
+-- for above we have to specify a inner join as we want the same/common data from different tables.
+SELECT CONCAT_WS("->", s.SNO, p.PNO, j.JNO) AS columnName, s.CITY
+FROM supplier AS s
+     JOIN part AS p ON s.CITY = p.CITY
+     JOIN project AS j ON p.CITY = j.CITY;
+-- OR
+SELECT CONCAT_WS("->", s.SNO, p.PNO, j.JNO) AS columnName, s.CITY
+FROM supplier AS s,
+     part AS p,
+     project AS j
+WHERE s.CITY=p.CITY AND p.CITY=j.CITY;
+
+

supplier.txt

@@ -1,5 +1,5 @@
 S1 SMITH 20 LONDON
-S2 JONES 10 PARRIS
-S3 BLAKE 30 PARRIS
+S2 JONES 10 PARIS
+S3 BLAKE 30 PARIS
 S4 CLARK 20 LONDON
 S5 ADAMS 30 ATHENS