如何将这 2 个 SQL 语句合并为一个?
我想在这里替换值 shape
:
SELECT path[1] AS number, st_x(geom), st_y(geom)
FROM st_dumppoints(shape)
由此:
SELECT shape
FROM tableA
WHERE id = 'test'
像这样:
SELECT path[1] AS number, st_x(geom), st_y(geom)
FROM st_dumppoints(SELECT shape FROM tableA WHERE id = 'test')
答案 0 :(得分:1)
只需在子选择周围添加一对额外的括号。在语法上,子查询需要括号,函数调用也需要,所以你最终得到
FROM st_dumppoints((SELECT shape FROM tableA WHERE id = 'test'))
请注意,如果子查询返回多于一行,该语句将导致错误。