比较符

    比较操作的结果是true或者false。

    Note

    • EMPTY当前仅用于判断，不支持函数或者运算操作，包括且不限于GROUP BY、count()、sum()、max()、、collect()、+、*。

    • NULL的比较操作和openCypher不同，行为也可能会改变。在openCypher中，IS [NOT] NULL通常与OPTIONAL MATCH一起使用，但是nGQL不支持OPTIONAL MATCH。

    示例

    字符串比较时，会区分大小写。不同类型的值不相等。

    Note

    >

    1. nebula> RETURN 3 > 2;
    2. +-------+
    3. | (3>2) |
    4. +-------+
    5. | true  |
    6. +-------+
    7. nebula> WITH 4 AS one, 3 AS two \
    8.         RETURN one > two AS result;
    9. +--------+
    10. | result |
    11. +--------+
    12. | true   |
    13. +--------+

    <

    1. nebula> YIELD 2.0 < 1.9;
    2. +---------+
    3. | (2<1.9) |
    4. +---------+
    6. +---------+

    !=

    1. nebula> YIELD 1 != '1';
    2. +--------+
    3. | (1!=1) |
    4. +--------+
    5. | true   |
    6. +--------+

    IS [NOT] EMPTY

    1. nebula> RETURN null IS EMPTY;
    2. | NULL IS EMPTY |
    3. +---------------+
    4. | false         |
    5. +---------------+
    7. nebula> RETURN "a" IS NOT EMPTY;
    8. +------------------+
    9. | "a" IS NOT EMPTY |
    10. +------------------+
    11. | true             |
    12. +------------------+
    14. nebula> GO FROM "player100" OVER * WHERE $$.player.name IS NOT EMPTY YIELD follow._dst;
    15. +-------------+
    16. | follow._dst |
    17. +-------------+
    18. | "player125" |
    19. +-------------+
    20. | "player101" |
    21. +-------------+