比较函数和运算符Graph
运算符 | 描述 |
---|---|
= | 赋值运算符 |
/ | 除法运算符 |
== | 等于运算符 |
!= | 不等于运算符 |
< | 小于运算符 |
<= | 小于或等于运算符 |
- | 减法运算符 |
% | 余数运算符 |
+ | 加法运算符 |
* | 乘法运算符 |
- | 负号运算符 |
udf_is_in() | 比较函数,判断值是否在指定的列表中 |
比较运算的结果是 true 或 false 。
- ==
等于。String的比较大小写敏感。不同类的值不相同:
nebula> YIELD 'A' == 'a';
==============
| ("A"=="a") |
==============
| false |
--------------
nebula> YIELD '2' == 2;
[ERROR (-8)]: A string type can not be compared with a non-string type.
- >
大于:
nebula> YIELD 3 > 2;
=========
| (3>2) |
=========
| true |
---------
- ≥
大于或等于:
nebula> YIELD 2 >= 2;
==========
| (2>=2) |
==========
| true |
----------
- <
小于:
nebula> YIELD 2.0 < 1.9;
=========================================
| (2.000000000000000<1.900000000000000) |
=========================================
| false |
-----------------------------------------
- ≤
小于或等于:
nebula> YIELD 0.11 <= 0.11;
========================
| (0.110000<=0.110000) |
========================
| true |
------------------------
- !=
不等于:
nebula> YIELD 1 != '1';
[ERROR (-8)]: A string type can not be compared with a non-string type.
- udf_is_in()
第一个参数为要比较的值。
nebula> YIELD udf_is_in(1,0,1,2);
======================
| udf_is_in(1,0,1,2) |
======================
| true |
----------------------
nebula> GO FROM 100 OVER follow WHERE udf_is_in($$.player.name, "Tony Parker"); /*由于udf_is_in 后面可能变更,所以该示例可能失效。*/
===============
| follow._dst |
===============
| 101 |
---------------
nebula> GO FROM 100 OVER follow YIELD follow._dst AS id | GO FROM $-.id OVER follow WHERE udf_is_in($-.id, 102, 102 + 1);
===============
| follow._dst |
===============
| 100 |
---------------
| 101 |
---------------
最后更新: 2020年5月12日