WindowFunctionType (H2 Database Engine 2.0.0 API)

java.lang.Object
- java.lang.Enum<WindowFunctionType>
- - org.h2.expression.analysis.WindowFunctionType

所有已实现的接口:

Serializable, Comparable<WindowFunctionType>
```
public enum WindowFunctionType
extends Enum<WindowFunctionType>
```
A type of a window function.

枚举常量概要

枚举常量
枚举常量和说明
`CUME_DIST` The type for CUME_DIST() window function.
`DENSE_RANK` The type for DENSE_RANK() window function.
`FIRST_VALUE` The type for FIRST_VALUE() window function.
`LAG` The type for LAG() window function.
`LAST_VALUE` The type for LAST_VALUE() window function.
`LEAD` The type for LEAD() window function.
`NTH_VALUE` The type for NTH_VALUE() window function.
`NTILE` The type for NTILE() window function.
`PERCENT_RANK` The type for PERCENT_RANK() window function.
`RANK` The type for RANK() window function.
`RATIO_TO_REPORT` The type for RATIO_TO_REPORT() window function.
`ROW_NUMBER` The type for ROW_NUMBER() window function.

方法概要

所有方法静态方法实例方法具体方法
限定符和类型	方法和说明
`static WindowFunctionType`	`get(String name)` Returns the type of window function with the specified name, or null.
`String`	`getSQL()` Returns SQL representation.
`boolean`	`requiresWindowOrdering()` Returns whether window function of this type requires window ordering clause.
`static WindowFunctionType`	`valueOf(String name)` 返回带有指定名称的该类型的枚举常量。
`static WindowFunctionType[]`	`values()` 按照声明该枚举类型的常量的顺序, 返回包含这些常量的数组。

从类继承的方法 java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- 枚举常量详细资料
  - ROW_NUMBER
```
public static final WindowFunctionType ROW_NUMBER
```
    The type for ROW_NUMBER() window function.
  - RANK
```
public static final WindowFunctionType RANK
```
    The type for RANK() window function.
  - DENSE_RANK
```
public static final WindowFunctionType DENSE_RANK
```
    The type for DENSE_RANK() window function.
  - PERCENT_RANK
```
public static final WindowFunctionType PERCENT_RANK
```
    The type for PERCENT_RANK() window function.
  - CUME_DIST
```
public static final WindowFunctionType CUME_DIST
```
    The type for CUME_DIST() window function.
  - NTILE
```
public static final WindowFunctionType NTILE
```
    The type for NTILE() window function.
  - LEAD
```
public static final WindowFunctionType LEAD
```
    The type for LEAD() window function.
  - LAG
```
public static final WindowFunctionType LAG
```
    The type for LAG() window function.
  - FIRST_VALUE
```
public static final WindowFunctionType FIRST_VALUE
```
    The type for FIRST_VALUE() window function.
  - LAST_VALUE
```
public static final WindowFunctionType LAST_VALUE
```
    The type for LAST_VALUE() window function.
  - NTH_VALUE
```
public static final WindowFunctionType NTH_VALUE
```
    The type for NTH_VALUE() window function.
  - RATIO_TO_REPORT
```
public static final WindowFunctionType RATIO_TO_REPORT
```
    The type for RATIO_TO_REPORT() window function.
- 方法详细资料
  - values
```
public static WindowFunctionType[] values()
```
    按照声明该枚举类型的常量的顺序, 返回包含这些常量的数组。该方法可用于迭代常量, 如下所示:
```
for (WindowFunctionType c : WindowFunctionType.values())
    System.out.println(c);
```
    返回:
    
    按照声明该枚举类型的常量的顺序返回的包含这些常量的数组
  - valueOf
```
public static WindowFunctionType valueOf(String name)
```
    返回带有指定名称的该类型的枚举常量。字符串必须与用于声明该类型的枚举常量的标识符完全匹配。(不允许有多余的空格字符。)
    
    参数:
    
    name - 要返回的枚举常量的名称。
    
    返回:
    
    返回带有指定名称的枚举常量
    
    抛出:
    
    IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量
    
    NullPointerException - 如果参数为空值
  - get
```
public static WindowFunctionType get(String name)
```
    Returns the type of window function with the specified name, or null.
    
    参数:
    
    name - name of a window function
    
    返回:
    
    the type of window function, or null.
  - getSQL
```
public String getSQL()
```
    Returns SQL representation.
    
    返回:
    
    SQL representation.
    
    另请参阅:
    
    Expression.getSQL(int)
  - requiresWindowOrdering
```
public boolean requiresWindowOrdering()
```
    Returns whether window function of this type requires window ordering clause.
    
    返回:
    
    true if it does, false if it may be omitted

枚举 WindowFunctionType

枚举常量概要

方法概要

从类继承的方法 java.lang.Enum

从类继承的方法 java.lang.Object

枚举常量详细资料

ROW_NUMBER

RANK

DENSE_RANK

PERCENT_RANK

CUME_DIST

NTILE

LEAD

LAG

FIRST_VALUE

LAST_VALUE

NTH_VALUE

RATIO_TO_REPORT

方法详细资料

values

valueOf

get

getSQL

requiresWindowOrdering