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dimitri-yatsenkodimitri-yatsenko
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add more queries to University
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‎short_tutorials/University.ipynb‎

Lines changed: 243 additions & 2 deletions
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@@ -30,7 +30,7 @@
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},
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"outputs": [],
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"source": [
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"schema = dj.schema('university')"
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"schema = dj.schema('university')\n"
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]
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},
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{
@@ -391,7 +391,6 @@
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"outputs": [],
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"source": [
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"# Enrollment \n",
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"\n",
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"terms = Term().fetch('KEY')\n",
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"quit_prob = 0.1\n",
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"for student in tqdm(Student.fetch('KEY')):\n",
@@ -406,6 +405,23 @@
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" random.sample(sections, random.randrange(min(5, len(sections)))))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# assign random grades\n",
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"grades = LetterGrade.fetch('grade')\n",
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"\n",
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"grade_keys = Enroll.fetch('KEY')\n",
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"random.shuffle(grade_keys)\n",
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"grade_keys = grade_keys[:len(grade_keys)*9//10]\n",
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"\n",
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"Grade.insert({**key, 'grade':grade} \n",
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" for key, grade in zip(grade_keys, random.choices(grades, k=len(grade_keys))))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
@@ -422,6 +438,13 @@
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"# Queries"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Restriction"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
@@ -500,6 +523,224 @@
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"millennials - Enroll"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Students who have not taken classes\n",
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"Student - Enroll"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Students who have taken Biology classes but no MATH courses\n",
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"(Student & (Enroll & 'dept=\"BIOL\"')) - (Enroll & 'dept=\"MATH\"')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Students who have not selected a major\n",
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"Student - StudentMajor"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Students who are taking courses in the current term\n",
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"Student - (Enroll & CurrentTerm)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Ungraded courses\n",
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"Enroll - Grade"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Ungraded courses in the current term\n",
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"(Enroll & CurrentTerm) - Grade"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Students who have taken classes and have chosen a major\n",
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"(Student & Enroll & StudentMajor)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"#Students who have taken classes or have chosen a major\n",
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"Student & [Enroll, StudentMajor]"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Enrollment in courses from the same department as the students' major\n",
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"Enroll & StudentMajor"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Join"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Grade point values\n",
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"Grade * LetterGrade"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Graded enrollments with complete course and student information\n",
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"Student * Enroll * Course * Section * Grade * LetterGrade"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Enrollment with major information\n",
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"Enroll * StudentMajor.proj(major='dept')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Enrollment outside chosen major\n",
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"Enroll * StudentMajor.proj(major='dept') & 'major<>dept'"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Enrollment not matching major \n",
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"Enroll - StudentMajor "
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Total grade points\n",
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"(Course * Grade * LetterGrade).proj(total='points*credits')"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Aggr"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Students in each section\n",
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"Section.aggr(Enroll, n='count(*)')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Average grade in each course\n",
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"Course.aggr(Grade*LetterGrade, avg_grade='avg(points)')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Fraction graded in each section\n",
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"(Section.aggr(Enroll,n='count(*)') * Section.aggr(Grade, m='count(*)')).proj(\n",
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" 'm','n',frac='m/n')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Student GPA\n",
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"Student.aggr(Course * Grade * LetterGrade, \n",
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" gpa='sum(points*credits)/sum(credits)')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Average GPA for each major\n",
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"gpa = Student.aggr(Course * Grade * LetterGrade,\n",
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" gpa='sum(points*credits)/sum(credits)')\n",
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"Department.aggr(StudentMajor*gpa, avg_gpa='avg(gpa)')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,

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