Question

CREATE TABLE rotated_bus AS SELECT AO_id,
RotateCoords(ST_Centroid(Geometry) FROM Substation, 45.00) AS Geometry FROM Busbar;

我试图通过在RotateCoords函数内传递多边形几何体（Substation）的质心来旋转线几何体（Busbar）。运行上面的查询后，我收到错误“接近FROM语法错误”。我的查询出了什么问题？

Answer 1

你可以加入两个表：

CREATE TABLE rotated_bus AS
SELECT Busbar.AO_id,
       RotateCoords(ST_Centroid(Substation.Geometry), 45) AS Geometry
FROM Busbar
JOIN Substation ON Busbar.AO_id = Substation.Substn_ID

或者，使用correlated subquery（子查询必须是一对额外括号内的完整查询）：

CREATE TABLE rotated_bus AS
SELECT AO_id,
       (SELECT RotateCoords(ST_Centroid(Geometry), 45)
        FROM Substation
        WHERE Substn_ID = Busbar.AO_id
       ) AS Geometry
FROM Busbar

在Spatialite查询中的RotateCoords函数中使用质心函数时出现语法错误

1 个答案: