Question

我正在使用SQLite，我想知道如何概括以下SQL语句，以便可以对任意数量的列施加不等式条件，而不仅仅是列x：

SELECT * FROM t WHERE x BETWEEN xMin AND xMAX

我预计这可以通过以下方式实现，但无济于事：

SELECT * FROM t 
WHERE (x BETWEEN xMin AND xMAX) 
  AND (y BETWEEN yMin AND yMax) 
  AND (z BETWEEN zMin AND zMax) ...

欢迎任何建议。

Answer 1

你的陈述应该有用，例如与Oracle合作：

SELECT * 
  FROM (SELECT 10 x, 40 y, 50 z 
          FROM dual) 
 WHERE (x BETWEEN 8 AND 12)
   AND (y BETWEEN 30 AND 42) 
   AND (z BETWEEN 0 AND 100);

见Fiddle demo。使用My SQL：

SELECT * 
  FROM (SELECT 10 AS x, 40 AS y, 50 AS z) AS t
 WHERE (x BETWEEN 8 AND 12)
   AND (y BETWEEN 30 AND 42) 
   AND (z BETWEEN 0 AND 100);

另一个MySQL Fiddle，SQLite Fiddle，PostgreSQL Fiddle：）

p.s。 （根据评论更新）：小心，

SELECT * 
  FROM (SELECT "10" AS x, "40" AS y, "50" AS z) AS t
 WHERE (x BETWEEN 8 AND 12)
   AND (y BETWEEN 30 AND 42) 
   AND (z BETWEEN 0 AND 100);

，也不

SELECT * 
  FROM (SELECT 10 AS x, 40 AS y, 50 AS z) AS t
 WHERE (x BETWEEN "8" AND "12")
   AND (y BETWEEN 30 AND 42) 
   AND (z BETWEEN 0 AND 100);

的工作原理。两者都在 DB Browser for SQLite （sqlitebrowser.org）中执行失败。

Answer 2

在SQLite 3中运行良好。

sqlite> CREATE TABLE test (x INT, y INT , z INT);
sqlite> INSERT INTO test (x,y,z) VALUES (1,2,3), (2,3,4), (4,5,6);
sqlite> SELECT * FROM test WHERE (x BETWEEN 0 AND 5) AND (y BETWEEN 0 AND 5) AND (z BETWEEN 0 AND 5)
   ...> ;
1|2|3
2|3|4
sqlite>

Answer 3

试试这个：

Select * from t where x >=xmin and x <= xmax and y >=ymin and y<= ymax...

如何编写使用多个BETWEEN优化的SQL查询？

3 个答案: