### Database Schema:
CREATE TABLE Genes (
	GeneID	TEXT	NOT NULL,
	Essential	TEXT	NOT NULL,
	Class	TEXT	NOT NULL,
	Complex	TEXT	NULL,
	Phenotype	TEXT	NOT NULL,
	Motif	TEXT	NOT NULL,
	Chromosome	INTEGER	NOT NULL,
	Function	TEXT	NOT NULL,
	Localization	TEXT	NOT NULL,
	foreign key (GeneID) references Classification (GeneID)
);

CREATE TABLE Classification (
	GeneID	TEXT	NOT NULL	PRIMARY KEY,
	Localization	TEXT	NOT NULL
);

CREATE TABLE Interactions (
	GeneID1	TEXT	NOT NULL	PRIMARY KEY,
	GeneID2	TEXT	NOT NULL	PRIMARY KEY,
	Type	TEXT	NOT NULL,
	Expression_Corr	REAL	NOT NULL,
	foreign key (GeneID1) references Classification (GeneID),
	foreign key (GeneID2) references Classification (GeneID)
);

### User's Query:
Which negatively correlated, genetically interacting genes are non-essential? What percentage do they represent with respect to those that are essential?

### Extra Knowledge:
If the Expression_Corr value is negative then it's negatively correlated; Percentage of Essensity = [count(negatively correlated, genetical interaction, non-essential) / count(negatively correlated, genetical interaction, non-essential+negatively correlated, genetical interaction, essential)] * 100%
SELECT CAST(COUNT(T1.GeneID) AS REAL) * 100 / ( SELECT COUNT(T1.GeneID) FROM Genes AS T1 INNER JOIN Interactions AS T2 ON T1.GeneID = T2.GeneID1 WHERE T2.Expression_Corr < 0 ) FROM Genes AS T1 INNER JOIN Interactions AS T2 ON T1.GeneID = T2.GeneID1 WHERE T2.Expression_Corr < 0 AND T1.Essential = 'Non-Essential'