Helper\Dialect\PostgresqlDialect::getAddForeignKey PHP Method

    protected function getAddForeignKey()
    {
        return [[null, 'fk1', 'ALTER TABLE "table" ADD CONSTRAINT "fk1" FOREIGN KEY ("column1") REFERENCES "ref_table" ("column2")'], ['schema', 'fk1', 'ALTER TABLE "schema"."table" ADD CONSTRAINT "fk1" FOREIGN KEY ("column1") REFERENCES "ref_table" ("column2")'], [null, 'fk2', 'ALTER TABLE "table" ADD CONSTRAINT "fk2" FOREIGN KEY ("column3", "column4") REFERENCES "ref_table" ("column5", "column6")'], ['schema', 'fk2', 'ALTER TABLE "schema"."table" ADD CONSTRAINT "fk2" FOREIGN KEY ("column3", "column4") REFERENCES "ref_table" ("column5", "column6")'], [null, 'fk3', 'ALTER TABLE "table" ADD CONSTRAINT "fk3" FOREIGN KEY ("column1") REFERENCES "ref_table" ("column2") ON DELETE CASCADE'], ['schema', 'fk3', 'ALTER TABLE "schema"."table" ADD CONSTRAINT "fk3" FOREIGN KEY ("column1") REFERENCES "ref_table" ("column2") ON DELETE CASCADE'], [null, 'fk4', 'ALTER TABLE "table" ADD CONSTRAINT "fk4" FOREIGN KEY ("column1") REFERENCES "ref_table" ("column2") ON UPDATE SET NULL'], ['schema', 'fk4', 'ALTER TABLE "schema"."table" ADD CONSTRAINT "fk4" FOREIGN KEY ("column1") REFERENCES "ref_table" ("column2") ON UPDATE SET NULL'], [null, 'fk5', 'ALTER TABLE "table" ADD CONSTRAINT "fk5" FOREIGN KEY ("column1") REFERENCES "ref_table" ("column2") ON DELETE CASCADE ON UPDATE NO ACTION'], ['schema', 'fk5', 'ALTER TABLE "schema"."table" ADD CONSTRAINT "fk5" FOREIGN KEY ("column1") REFERENCES "ref_table" ("column2") ON DELETE CASCADE ON UPDATE NO ACTION']];
    }