Update docs.

docs/_posts/2006-01-02-aggregate-functions.md

@@ -13,80 +13,125 @@ If distinct option is specified, aggregate functions calculate only unique value
 
 | name | description |
 | :- | :- |
-| [COUNT](#count) | Return the number of rows |
-| [MAX](#max) | |
-| [MIN](#min) | |
-| [SUM](#sum) | |
-| [AVG](#avg) | |
-| [GROUP_CONCAT](#group_concat) | |
+| [COUNT](#count) | Return the number of values |
+| [MAX](#max) | Return the maximum value |
+| [MIN](#min) | Return the minimum value |
+| [SUM](#sum) | Return the sum of values |
+| [AVG](#avg) | Return the average of values |
+| [GROUP_CONCAT](#group_concat) | Return the concatenated string of values |
 
 ## Definitions
 
 ### COUNT
 {: #count}
 
 ```
-COUNT([DISTINCT] expr) return integer
+COUNT([DISTINCT] expr)
 ```
 
-Returns a number of non-null values of expr.
+_expr_
+: [value]({{ '/reference/value.html' | relative_url }})
+
+_return_
+: [integer]({{ '/reference/value.html#integer' | relative_url }})
+
+Returns the number of non-null values of _expr_.
 
 ```
-COUNT([DISTINCT] *) return integer
+COUNT([DISTINCT] *)
 ```
 
-Return the number of values of expr including null values.
+_return_
+: [integer]({{ '/reference/value.html#integer' | relative_url }})
+
+Return the number of all values including null values.
 
 ### MAX
 {: #max}
 
 ```
-MAX([DISTINCT] expr) return value
+MAX([DISTINCT] expr)
 ```
 
-Returns the maximum value of non-null values of expr.
+_expr_
+: [value]({{ '/reference/value.html' | relative_url }})
+
+_return_
+: [value]({{ '/reference/value.html' | relative_url }})
+
+Returns the maximum value of non-null values of _expr_.
 If all values are null, return null.
 
 ### MIN
 {: #min}
 
 ```
-MIN([DISTINCT] expr) return value
+MIN([DISTINCT] expr)
 ```
 
-Returns the minimum value of non-null values of expr.
+_expr_
+: [value]({{ '/reference/value.html' | relative_url }})
+
+_return_
+: [value]({{ '/reference/value.html' | relative_url }})
+
+Returns the minimum value of non-null values of _expr_.
 If all values are null, return null.
 
 ### SUM
 {: #sum}
 
 ```
-SUM([DISTINCT] expr) return decimal
+SUM([DISTINCT] expr)
 ```
 
-Returns the sum of non-null values of expr.
+_expr_
+: [value]({{ '/reference/value.html' | relative_url }})
+
+_return_
+: [float]({{ '/reference/value.html#float' | relative_url }}) or [integer]({{ '/reference/value.html#integer' | relative_url }})
+
+Returns the sum of non-null values of _expr_.
 If all values are null, return null.
 
 ### AVG
 {: #avg}
 
 ```
-AVG([DISTINCT] expr) return decimal
+AVG([DISTINCT] expr)
 ```
 
-Returns the average of non-null values of expr.
+_expr_
+: [value]({{ '/reference/value.html' | relative_url }})
+
+_return_
+: [float]({{ '/reference/value.html#float' | relative_url }}) or [integer]({{ '/reference/value.html#integer' | relative_url }})
+
+Returns the average of non-null values of _expr_.
 If all values are null, return null.
 
 ### GROUP_CONCAT
 {: #group_concat}
 
 ```
-GROUP_CONCAT([DISTINCT] expr [order_by_clause] [SEPARATOR string]) return string
+GROUP_CONCAT([DISTINCT] expr [order_by_clause] [SEPARATOR sep])
 ```
 
-Return the string result with the concatenated non-null values of expr.
+_expr_
+: [value]({{ '/reference/value.html' | relative_url }})
+
+_order_by_clause_
+: [Order By Clause]({{ '/reference/select-query.html#order_by_clause' | relative_url }})
+
+_sep_
+: [string]({{ '/reference/value.html#string' | relative_url }})
+
+_return_
+: [string]({{ '/reference/value.html#string' | relative_url }})
+
+Return the string result with the concatenated non-null values of _expr_.
 If all values are null, return null.
 
-Separator string is placed between values. Default separator string is empty string.
+Separator string _sep_ is placed between values. Default separator string is empty string.
 
-By using order by clause, you can sort values.
+By using _order_by_clause_, you can sort values.

docs/_posts/2006-01-02-cast-functions.md

@@ -8,53 +8,101 @@ category: reference
 
 | name | description |
 | :- | :- |
-| [STRING](#string) | |
-| [INTEGER](#integer) | |
-| [FLOAT](#float) | |
-| [BOOLEAN](#boolean) | |
-| [TERNARY](#ternary) | |
-| [DATETIME](#datetime) | |
+| [STRING](#string) | Convert a value to a string |
+| [INTEGER](#integer) | Convert a value to a integer |
+| [FLOAT](#float) | Convert a value to a float |
+| [BOOLEAN](#boolean) | Convert a value to a boolean |
+| [TERNARY](#ternary) | Convert a value to a ternary |
+| [DATETIME](#datetime) | Convert a value to a datetime |
 
 ## Definitions
 
 ### STRING
 {: #string}
 
 ```
-STRING(value) return string
+STRING(value)
 ```
 
+_value_
+: [value]({{ '/reference/value.html' | relative_url }})
+
+_return_
+: [string]({{ '/reference/value.html#string' | relative_url }})
+
+Convert a value to a string.
+
 ### INTEGER
 {: #integer}
 
 ```
-INTEGER(value) return integer
+INTEGER(value)
 ```
 
+_value_
+: [value]({{ '/reference/value.html' | relative_url }})
+
+_return_
+: [integer]({{ '/reference/value.html#integer' | relative_url }})
+
+Convert a value to a integer.
+
 ### FLOAT
 {: #float}
 
 ```
-FLOAT(value) return float
+FLOAT(value)
 ```
 
+_value_
+: [value]({{ '/reference/value.html' | relative_url }})
+
+_return_
+: [float]({{ '/reference/value.html#float' | relative_url }})
+
+Convert a value to a float.
+
 ### BOOLEAN
 {: #boolean}
 
 ```
-BOOLEAN(value) return boolean
+BOOLEAN(value)
 ```
 
+_value_
+: [value]({{ '/reference/value.html' | relative_url }})
+
+_boolean_
+: [boolean]({{ '/reference/value.html#boolean' | relative_url }})
+
+Convert a value to a boolean.
+
 ### TERNARY
 {: #ternary}
 
 ```
-TERNARY(value) return ternary
+TERNARY(value)
 ```
 
+_value_
+: [value]({{ '/reference/value.html' | relative_url }})
+
+_return_
+: [ternary]({{ '/reference/value.html#ternary' | relative_url }})
+
+Convert a value to a ternary.
+
 ### DATETIME
 {: #datetime}
 
 ```
-DATETIME(value) return datetime
+DATETIME(value)
 ```
+
+_value_
+: [value]({{ '/reference/value.html' | relative_url }})
+
+_return_
+: [datetime]({{ '/reference/value.html#datetime' | relative_url }})
+
+Convert a value to a datetime.

docs/_posts/2006-01-02-control-flow.md

@@ -97,4 +97,4 @@ A Break statement stops statements execution in loop, then exit from current loo
 EXIT;
 ```
 
-A Exit statement stops statements execution, then terminates current program without commit.
+A Exit statement stops statements execution, then terminates the executing procedure without commit.