More documentation

KyGost · KyGost · commit 20de1a0ff973 · 2022-04-12T16:29:20.000+10:00
diff --git a/src/SUMMARY.md b/src/SUMMARY.md
@@ -9,16 +9,15 @@
 	- [CREATE]()
 	- [DELETE]()
 - [Functions](./functions.md)
-	- [CAST]()
+	- [CAST](./functions/CAST.md)
 	- [CONVERT]()
-	- [CASE]()
-	- [IIF]()
-	- [IFNULL]()
-	- [NULLIF]()
-	- [LEFT]()
-	- [RIGHT]()
-	- [UPPER]()
-	- [LOWER]()
+	- [IIF](./functions/IIF.md)
+	- [IFNULL](./functions/IFNULL.md)
+	- [NULLIF](./functions/NULLIF.md)
+	- [LEFT](./functions/LEFT.md)
+	- [RIGHT](./functions/RIGHT.md)
+	- [UPPER](./functions/UPPER.md)
+	- [LOWER](./functions/LOWER.md)
 - [Additional Information]()
 	- [Database Types](./other/databases.md)
 	- [Data Types]()
diff --git a/src/functions/CASE.md b/src/functions/CASE.md
diff --git a/src/functions/CAST.md b/src/functions/CAST.md
@@ -1 +1,15 @@
 # CAST
+Return `$1` [casted](./concepts/casting.md) to `$A`
+
+## Syntax
+```SQL
+CAST($1 AS $A)
+```
+
+## Parameters
+
+### `$1`
+May be anything
+
+### `$A`
+Should be a [type name](./other/types.md)
diff --git a/src/functions/IFNULL.md b/src/functions/IFNULL.md
@@ -1 +1,21 @@
 # IFNULL
+If `$1` is `NULL`, return `$2`, else return `$1`.
+
+## Syntax
+```SQL
+IFNULL($1, $2)
+```
+
+## Parameters
+
+### `$1`
+May be anything
+
+### `$2`
+May be anything
+
+
+## Same as
+```SQL
+IIF($1 IS NULL, $2, $1)
+```
diff --git a/src/functions/IIF.md b/src/functions/IIF.md
@@ -1 +1,27 @@
 # IIF
+If `$1`, return `$2`, else return `$3`.
+
+## Syntax
+```SQL
+IIF($1, $2, $3)
+```
+
+## Parameters
+
+### `$1`
+Should evaluate to a [boolean](./other/types.md#boolean)
+
+### `$2`
+May be anything
+
+### `$3`
+May be anything
+
+
+## Same as
+```SQL
+CASE
+	WHEN $1 THEN $2
+	END $3
+END
+```
diff --git a/src/functions/LEFT.md b/src/functions/LEFT.md
@@ -1 +1,15 @@
 # LEFT
+If `$1` has more than `$2` characters, return the left-most `$2` characters. Else return `$1`.
+
+## Syntax
+```SQL
+LEFT($1, $2)
+```
+
+## Parameters
+
+### `$1`
+Should evaluate to a [string](./other/types.md#text)
+
+### `$2`
+Should evaluate to an [integer](./other/types.md#unsigned_integer)
diff --git a/src/functions/LOWER.md b/src/functions/LOWER.md
@@ -1 +1,12 @@
 # LOWER
+Return `$1` with all characters in lowercase.
+
+## Syntax
+```SQL
+LOWER($1)
+```
+
+## Parameters
+
+### `$1`
+Should evaluate to a [string](./other/types.md#text)
diff --git a/src/functions/NULLIF.md b/src/functions/NULLIF.md
@@ -1 +1,21 @@
 # NULLIF
+If `$1` equals `$2`, return `NULL`, else return `$1`.
+
+## Syntax
+```SQL
+NULLIF($1, $2)
+```
+
+## Parameters
+
+### `$1`
+May be anything
+
+### `$2`
+May be anything
+
+
+## Same as
+```SQL
+IIF($1 = $2, NULL, $1)
+```
diff --git a/src/functions/RIGHT.md b/src/functions/RIGHT.md
@@ -1 +1,15 @@
 # RIGHT
+If `$1` has more than `$2` characters, return the right-most `$2` characters. Else return `$1`.
+
+## Syntax
+```SQL
+LEFT($1, $2)
+```
+
+## Parameters
+
+### `$1`
+Should evaluate to a [string](./other/types.md#text)
+
+### `$2`
+Should evaluate to an [integer](./other/types.md#unsigned_integer)
diff --git a/src/functions/UPPER.md b/src/functions/UPPER.md
@@ -1 +1,12 @@
 # UPPER
+Return `$1` with all characters in lowercase.
+
+## Syntax
+```SQL
+UPPER($1)
+```
+
+## Parameters
+
+### `$1`
+Should evaluate to a [string](./other/types.md#text)
