Merge pull request #328 from yadavan88/drop-null-sql

Queries to drop not null constraint

Author: davidmartinezbarua

sql-constraints/drop-not-null/drop-null-mysql.sql

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+ALTER TABLE Student
+MODIFY COLUMN national_id BIGINT NULL;

sql-constraints/drop-not-null/drop-null-pg.sql

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+ALTER TABLE student 
+ALTER COLUMN national_id 
+DROP NOT NULL;

sql-constraints/drop-not-null/drop-null-sqlserver.sql

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+ALTER TABLE Student  
+ALTER COLUMN national_id BIGINT NULL;

sql-constraints/drop-not-null/reset.sql

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+-- PostgreSQL
+ALTER TABLE student 
+ALTER COLUMN national_id 
+SET NOT NULL;
+
+-- MySQL
+ALTER TABLE student 
+MODIFY COLUMN national_id BIGINT NOT NULL;
+
+-- SQL Server
+ALTER TABLE student  
+ALTER COLUMN national_id BIGINT NOT NULL;