"@"

📄字数 423

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功能描述

如果几何体 A 的边界框完全包含在几何体 B 的边界框内，则 @ 操作符返回 TRUE。

语法格式

BOOLEAN @( GEOMETRY A , GEOMETRY B );

参数说明

• A：目标 GEOMETRY 对象。
• B：目标 GEOMETRY 对象。

函数返回类型

BOOLEAN 类型

使用说明

1. 该操作符将利用几何上可能可用的任何索引。

示例

SQL> SELECT tbl1.c1 AS t1_c1, tbl2.c1 AS t2_c1, tbl1.goem @ tbl2.goem AS contained
        FROM (
        SELECT 1 AS c1, 'LINESTRING(1 1, 3 3)'::GEOMETRY AS goem ) AS tbl1,
        (
        SELECT 2 AS c1, 'LINESTRING(0 0, 4 4)'::GEOMETRY AS goem UNION ALL
        SELECT 3 AS c1, 'LINESTRING(2 2, 4 4)'::GEOMETRY AS goem UNION ALL
        SELECT 4 AS c1, 'LINESTRING(1 1, 3 3)'::GEOMETRY AS goem
        ) AS tbl2;

+-------+-------+-----------+
| T1_C1 | T2_C1 | CONTAINED |
+-------+-------+-----------+
| 1     | 2     | T         |
| 1     | 3     | F         |
| 1     | 4     | T         |
+-------+-------+-----------+

(3 rows)