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https://github.com/waldohidalgo/periodic_table_database
Repositorio con los archivos necesarios para aprobar el proyecto número 4: Build a Periodic Table Database para obtener la Relational Database Certification
https://github.com/waldohidalgo/periodic_table_database
freecodecamp freecodecamp-challenge freecodecamp-project periodic-table-database
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Repositorio con los archivos necesarios para aprobar el proyecto número 4: Build a Periodic Table Database para obtener la Relational Database Certification
- Host: GitHub
- URL: https://github.com/waldohidalgo/periodic_table_database
- Owner: waldohidalgo
- Created: 2024-09-09T21:29:19.000Z (4 months ago)
- Default Branch: main
- Last Pushed: 2024-09-09T21:35:03.000Z (4 months ago)
- Last Synced: 2024-09-10T02:18:54.033Z (4 months ago)
- Topics: freecodecamp, freecodecamp-challenge, freecodecamp-project, periodic-table-database
- Language: Shell
- Homepage:
- Size: 245 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Build a Periodic Table Database
Repositorio con los archivos necesarios para aprobar el [proyecto requisito obligatorio número 4](https://www.freecodecamp.org/learn/relational-database/build-a-periodic-table-database-project/build-a-periodic-table-database). Proyecto para obtener la [Relational Database Certification](https://www.freecodecamp.org/learn/relational-database/) de freecodecamp
## Tabla de Contenidos
- [Build a Periodic Table Database](#build-a-periodic-table-database)
- [Tabla de Contenidos](#tabla-de-contenidos)
- [Instrucciones y All tests passed](#instrucciones-y-all-tests-passed)
- [Proyecto Aprobado](#proyecto-aprobado)
- [Script Bash](#script-bash)
- [Comandos SQL](#comandos-sql)
## Instrucciones y All tests passed
## Proyecto Aprobado
## Script Bash
```bash
#!/bin/bash
PSQL="psql --username=freecodecamp --dbname=periodic_table -t --no-align -c"
NOT_FOUND() {
echo "I could not find that element in the database."
}
SHOW_DATA() {
# $1 para tipo de consulta y $2 para el dato a buscar
case "$1" in
"atomic_number")
RESULT=$($PSQL "SELECT atomic_number,name,symbol,type,atomic_mass,melting_point_celsius,boiling_point_celsius FROM elements INNER JOIN properties USING(atomic_number) INNER JOIN types USING(type_id) WHERE atomic_number=$2 ORDER BY atomic_number;")
;;
"symbol")
RESULT=$($PSQL "SELECT atomic_number,name,symbol,type,atomic_mass,melting_point_celsius,boiling_point_celsius FROM elements INNER JOIN properties USING(atomic_number) INNER JOIN types USING(type_id) WHERE UPPER(symbol)=UPPER('$2') ORDER BY atomic_number;")
;;
"name")
RESULT=$($PSQL "SELECT atomic_number,name,symbol,type,atomic_mass,melting_point_celsius,boiling_point_celsius FROM elements INNER JOIN properties USING(atomic_number) INNER JOIN types USING(type_id) WHERE UPPER(name)=UPPER('$2') ORDER BY atomic_number;")
;;
esac
if [[ -z $RESULT ]]; then
NOT_FOUND
else
echo "$RESULT" | while IFS="|" read ATOMIC_NUMBER NAME SYMBOL TYPE ATOMIC_MASS MELTING_POINT_CELSIUS BOILING_POINT_CELSIUS; do
echo "The element with atomic number $ATOMIC_NUMBER is $NAME ($SYMBOL). It's a $TYPE, with a mass of $ATOMIC_MASS amu. $NAME has a melting point of $MELTING_POINT_CELSIUS celsius and a boiling point of $BOILING_POINT_CELSIUS celsius."
done
fi
}
RUN() {
if [[ -z $1 ]]; then
echo "Please provide an element as an argument."
else
if [[ $1 =~ ^[0-9]+$ ]]; then
SHOW_DATA "atomic_number" $1
else
# search on symbol
if [[ $(echo "$1" | tr '[:lower:]' '[:upper:]') =~ ^[A-Z]{1,2}$ ]]; then
SHOW_DATA "symbol" $1
else
# search on name
SHOW_DATA "name" $1
fi
fi
fi
}
RUN $1
```
## Comandos SQL
```sql
ALTER TABLE properties RENAME COLUMN weight TO atomic_mass;
ALTER TABLE properties RENAME COLUMN melting_point TO melting_point_celsius;
ALTER TABLE properties RENAME COLUMN boiling_point TO boiling_point_celsius;
ALTER TABLE properties ALTER COLUMN melting_point_celsius SET NOT NULL;
ALTER TABLE properties ALTER COLUMN boiling_point_celsius SET NOT NULL;
ALTER TABLE elements ADD CONSTRAINT elements_symbol_key UNIQUE (symbol);
ALTER TABLE elements ADD CONSTRAINT elements_name_key UNIQUE (name);
ALTER TABLE elements ALTER COLUMN symbol SET NOT NULL;
ALTER TABLE elements ALTER COLUMN name SET NOT NULL;
ALTER TABLE properties ADD CONSTRAINT properties_atomic_number_fkey FOREIGN KEY (atomic_number) REFERENCES elements (atomic_number);
CREATE TABLE types (type_id SERIAL PRIMARY KEY, type VARCHAR NOT NULL);
INSERT INTO types (type) VALUES ('metal'), ('nonmetal'), ('metalloid');
/*
Crear columna type_id
*/
ALTER TABLE properties ADD COLUMN type_id INT;
UPDATE properties SET type_id = (SELECT type_id FROM types WHERE types.type = properties.type);
ALTER TABLE properties ADD CONSTRAINT fkey_properties_type_id FOREIGN KEY (type_id) REFERENCES types (type_id);
ALTER TABLE properties ALTER COLUMN type_id SET NOT NULL;
UPDATE elements SET symbol=INITCAP(symbol);
/*
Cambiar tipo de dato numeric(9,6) a solo numeric
*/
ALTER TABLE properties ALTER COLUMN atomic_mass TYPE decimal;
DELETE FROM properties WHERE atomic_number=1000;
DELETE FROM elements WHERE atomic_number=1000;
ALTER TABLE properties DROP COLUMN type;
INSERT INTO elements (atomic_number,name, symbol) VALUES (9,'Fluorine', 'F');
INSERT INTO properties (atomic_number, atomic_mass, melting_point_celsius, boiling_point_celsius, type_id) VALUES (9, 18.998, -220, -188.1, 2);
INSERT INTO elements (atomic_number,name, symbol) VALUES (10,'Neon', 'Ne');
INSERT INTO properties (atomic_number, atomic_mass, melting_point_celsius, boiling_point_celsius, type_id) VALUES (10, 20.18, -248.6, -246.1, 2);
SELECT atomic_number,name,symbol,type,atomic_mass,melting_point_celsius,boiling_point_celsius FROM elements INNER JOIN properties USING(atomic_number) INNER JOIN types USING(type_id) ORDER BY atomic_number;
```