Data Dungeon
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Section 4

Null Cathedral

Missing values, integrity rites, and hollow columns.

Floors 16–20 · 14 chambers · 4505 XP

Floor 16

Hollow Nave

…
  1. Chamber 47Locked

    Void Register

    IS NOT NULL

    NULL
    +265 XPPreview →
  2. Chamber 48Locked

    Hollow Filter

    NULL with AND

    NULLWHERE
    +275 XPPreview →
  3. Chamber 49Locked

    Blank Epitaph

    COALESCE in the nave

    COALESCE
    +285 XPPreview →

Floor 17

Absence Choir

…
  1. Chamber 50Locked

    Orphan Pews

    LEFT JOIN + IS NULL

    LEFT JOINNULL
    +290 XPPreview →
  2. Chamber 51Locked

    Twin Psalms

    UNION ALL keeps duplicates

    UNION ALLORDER BY
    +300 XPPreview →
  3. Chamber 52Locked

    Rite Label

    CASE meets NULL

    CASENULL
    +310 XPPreview →

Floor 18

Integrity Crypt

…
  1. Chamber 53Locked

    Excommunicate

    NOT IN

    INSubquery
    +315 XPPreview →
  2. Chamber 54Locked

    Absent Mass

    NOT EXISTS

    EXISTS
    +325 XPPreview →
  3. Chamber 55Locked

    Tithe Null

    COALESCE inside SUM

    COALESCEGROUP BY
    +335 XPPreview →

Floor 19

Fractured Transept

…
  1. Chamber 56Locked

    Hollow Join

    LEFT JOIN + COALESCE

    LEFT JOINCOALESCE
    +340 XPPreview →
  2. Chamber 57Locked

    Rank the Hollow

    Window + COALESCE

    WindowCOALESCEORDER BY
    +350 XPPreview →
  3. Chamber 58Locked

    Integrity Rite

    JOIN + NULL + IN

    INNER JOINNULLIN
    +360 XPPreview →

Floor 20

Cardinal Void

…
  1. Chamber 59Locked

    Cardinal Prelude

    COALESCE, IN, IS NOT NULL

    COALESCENULLIN
    +365 XPPreview →
  2. Section Boss
    Chamber 60Locked

    Null Cardinal

    Close the Null Cathedral

    BossWindowEXISTSNULLINNER JOINCOALESCEORDER BY
    +390 XPPreview →