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Auto-generated via `{sandpaper}` Source : 725be22 Branch : main Author : alexthrelkeld <127440629+alexthrelkeld@users.noreply.github.com> Time : 2026-03-27 12:41:27 +0000 Message : Simplified data-type table in first episode (#385) * simplified data type table * improve descriptions in episode 1 data types table * added data type quick reference table to cheat sheet * Validation and clean-up of types in different database system * Final fixes with references to vendor documentation --------- Co-authored-by: James Foster <James.Foster@csiro.au>
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‎00-sql-introduction.md‎

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10. In the center panel of the window that appears, set the data types for each field using the suggestions in the table below (this includes fields from the `plots` and `species` tables also).
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11. Finally, click **OK** one more time to confirm the operation. Then click the **Write Changes** button to save the database.
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| Field | Data Type | Motivation | Table(s) |
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| ----------------------------------------------------- | :------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------- | ---------------- |
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| day | INTEGER | Having data as numeric allows for meaningful arithmetic and comparisons | surveys |
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| genus | TEXT | Field contains text data | species |
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| hindfoot\_length | REAL | Field contains measured numeric data | surveys |
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| month | INTEGER | Having data as numeric allows for meaningful arithmetic and comparisons | surveys |
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| plot\_id | INTEGER | Field contains numeric data | plots, surveys |
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| plot\_type | TEXT | Field contains text data | plots |
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| record\_id | INTEGER | Field contains numeric data | surveys |
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| sex | TEXT | Field contains text data | surveys |
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| species\_id | TEXT | Field contains text data | species, surveys |
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| species | TEXT | Field contains text data | species |
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| taxa | TEXT | Field contains text data | species |
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| weight | REAL | Field contains measured numerical data | surveys |
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| year | INTEGER | Allows for meaningful arithmetic and comparisons | surveys |
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| Field | Data Type | Motivation | Table(s) |
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| ----------------------------------------------------- | :----------------------- | ----------------------------------------------------------------------- | ---------------- |
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| day | INTEGER | Having data as numeric allows for meaningful arithmetic and comparisons | surveys |
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| genus | TEXT | Field contains text data | species |
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| hindfoot\_length | REAL | Field contains measured numeric data | surveys |
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| month | INTEGER | Having data as numeric allows for meaningful arithmetic and comparisons | surveys |
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| plot\_id | INTEGER | Field contains numeric data | plots, surveys |
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| plot\_type | TEXT | Field contains text data | plots |
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| record\_id | INTEGER | Field contains numeric data | surveys |
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| sex | TEXT | Field contains text data | surveys |
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| species\_id | TEXT | Field contains text data | species, surveys |
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| species | TEXT | Field contains text data | species |
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| taxa | TEXT | Field contains text data | species |
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| weight | REAL | Field contains measured numerical data | surveys |
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| year | INTEGER | Allows for meaningful arithmetic and comparisons | surveys |
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::::::::::::::::::::::::::::::::::::::: challenge
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### Challenge
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- Import the `plots` and `species` tables
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::::::::::::::::::::::::::::::::::::::::::::::::::
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### Data types {#datatypes}
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| Data type | Description |
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| ----------------------------------------------------- | :------------------------------------------------------------------------------------------------------- |
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| CHARACTER(n) | Character string. Fixed-length n |
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| VARCHAR(n) or CHARACTER VARYING(n) | Character string. Variable length. Maximum length n |
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| BINARY(n) | Binary string. Fixed-length n |
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| BOOLEAN | Stores TRUE or FALSE values |
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| VARBINARY(n) or BINARY VARYING(n) | Binary string. Variable length. Maximum length n |
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| INTEGER(p) | Integer numerical (no decimal). |
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| SMALLINT | Integer numerical (no decimal). |
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| INTEGER | Integer numerical (no decimal). |
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| BIGINT | Integer numerical (no decimal). |
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| DECIMAL(p,s) | Exact numerical, precision p, scale s. |
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| NUMERIC(p,s) | Exact numerical, precision p, scale s. (Same as DECIMAL) |
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| FLOAT(p) | Approximate numerical, mantissa precision p. A floating number in base 10 exponential notation. |
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| REAL | Approximate numerical |
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| FLOAT | Approximate numerical |
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| DOUBLE PRECISION | Approximate numerical |
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| DATE | Stores year, month, and day values |
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| TIME | Stores hour, minute, and second values |
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| TIMESTAMP | Stores year, month, day, hour, minute, and second values |
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| INTERVAL | Composed of a number of integer fields, representing a period of time, depending on the type of interval |
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| ARRAY | A set-length and ordered collection of elements |
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| MULTISET | A variable-length and unordered collection of elements |
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| XML | Stores XML data |
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### SQL Data Type Quick Reference {#datatypediffs}
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Different databases offer different choices for the data type definition.
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The following table shows some of the common names of data types between the various database platforms:
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| Data type | Access | SQLServer | Oracle | MySQL | PostgreSQL |
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| :---------------------------------------------------- | :------------------------------------------------------------------------------------------------------- | :---------------------------------------------------------------------- | :--------------- | :------------ | :------------ |
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| boolean | Yes/No | Bit | Byte | N/A | Boolean |
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| integer | Number (integer) | Int | Number | Int / Integer | Int / Integer |
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| float | Number (single) | Float / Real | Number | Float | Numeric |
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| currency | Currency | Money | N/A | N/A | Money |
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| string (fixed) | N/A | Char | Char | Char | Char |
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| string (variable) | Text (\<256) / Memo (65k+) | Varchar | Varchar2 | Varchar | Varchar |
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| binary object OLE Object Memo Binary (fixed up to 8K) | Varbinary (\<8K) | Image (\<2GB) Long | Raw Blob | Text Binary | Varbinary |
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SQLite has four data types, shown in the table below.
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| Data type | Description |
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| ------------------ | :-------------------------------------------------------------------------------------------------------------------- |
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| TEXT | Text string |
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| INTEGER | Integer (positive or negative whole number) |
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| REAL | Approximate numerical value (floating point number) |
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| BLOB | General data with no specfic type, stored in the database exactly as given (stands for _Binary Large OBject_) |
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In addition to these four data types, SQLite has a NULL value for missing data. We will talk more about dealing with missing data in Episode 3.
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:::::::::::::::::::::::::::::::::::::::: keypoints
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‎md5sum.txt‎

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