19 lines
421 B
SQL
19 lines
421 B
SQL
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-- Your SQL goes here
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alter table kecheng
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rename column group_id to kecheng_teacher_id;
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alter table kecheng
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alter column kecheng_teacher_id set not null;
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alter table kecheng
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drop column teacher_id;
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alter table kecheng
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rename to kecheng_student;
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alter table kecheng_student
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add constraint kecheng_student_kecheng_teacher_id_fk
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foreign key (kecheng_teacher_id) references kecheng_teacher;
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