Columns
| Column | Type | Size | Nulls | Auto | Default | Children | Parents | Comments | ||
|---|---|---|---|---|---|---|---|---|---|---|
| id | BIGINT | 19 | √ | null |
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| hashcode | VARCHAR | 40 |
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sha1 hash of serialized qubaids_condition class. Unique for every combination of class name and property. |
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| timemodified | BIGINT | 19 | null |
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| questionid | BIGINT | 19 | null |
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| slot | BIGINT | 19 | √ | null |
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The position in the quiz where this question appears |
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| subquestion | SMALLINT | 5 | null |
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| variant | BIGINT | 19 | √ | null |
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| s | BIGINT | 19 | 0 |
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| effectiveweight | DECIMAL | 15,5 | √ | null |
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| negcovar | TINYINT | 3 | 0 |
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| discriminationindex | DECIMAL | 15,5 | √ | null |
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| discriminativeefficiency | DECIMAL | 15,5 | √ | null |
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| sd | DECIMAL | 15,10 | √ | null |
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| facility | DECIMAL | 15,10 | √ | null |
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| subquestions | LONGTEXT | 2147483647 | √ | null |
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| maxmark | DECIMAL | 12,7 | √ | null |
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| positions | LONGTEXT | 2147483647 | √ | null |
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positions in which this item appears. Only used for random questions. |
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| randomguessscore | DECIMAL | 12,7 | √ | null |
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An estimate of the score a student would get by guessing randomly. |
Indexes
| Constraint Name | Type | Sort | Column(s) |
|---|---|---|---|
| PRIMARY | Primary key | Asc | id |
| quesstat_has_ix | Performance | Asc | hashcode |
| quesstat_que_ix | Performance | Asc | questionid |