本文为您介绍如何使用实时计算Flink版逻辑运算函数BETWEEN AND。

语法

A BETWEEN B AND C

入参

参数 数据类型
A DOUBLE，BIGINT，INT，VARCHAR，DATE，TIMESTAMP，TIME
B DOUBLE，BIGINT，INT，VARCHAR，DATE，TIMESTAMP，TIME
C DOUBLE，BIGINT，INT，VARCHAR，DATE，TIMESTAMP，TIME

功能描述

BETWEEN操作符用于选取介于两个值之间的数据范围内的值。

示例1

  • 测试数据
    int1(INT) int2(INT) int3(INT)
    90 80 100
    11 10 7
  • 测试语句 
    SELECT int1 as aa
FROM T1
WHERE int1 BETWEEN int2 AND int3;
  • 测试结果
    aa(int)
    90

示例2

  • 测试数据
    var1(varchar) var2(varchar) var3(varchar)
    b a c
  • 测试语句 
    SELECT var1 as aa
FROM T1
WHERE var1 BETWEEN var2 AND var3;
  • 测试结果
    aa(varchar)
    b

示例3

  • 测试数据
    TIMESTAMP1(TIMESTAMP) TIMESTAMP2(TIMESTAMP) TIMESTAMP3(TIMESTAMP)
    1969-07-20 20:17:30 1969-07-20 20:17:20 1969-07-20 20:17:45
  • 测试语句 
    SELECT TIMESTAMP1 as aa
FROM T1
WHERE TIMESTAMP1 BETWEEN TIMESTAMP2 AND TIMESTAMP3;
  • 测试结果
    aa(TIMESTAMP)
    1969-07-20 20:17:30