我试图从这两个表中创建一个视图:
我当前的SQL代码没有显示错误,它只显示零结果:
CREATE VIEW `current_job` AS SELECT
a1.OBJ_NAME,
a1.TYP,
a1.OBJ_ID,
a1.DEVICE_ID,
a2.DESCRIP,
a3.CATEGORY,
a4.INFORMATION
FROM `job21433` a1, `master_setpoints_view` a2, `master_setpoints_view` a3, `master_setpoints_view` a4
WHERE
a1.JOBNUM = "21433189-01"
AND
a2.DESCRIP = a1.OBJ_NAME
AND
a3.CATEGORY = a1.OBJ_NAME
AND
a4.INFORMATION = a1.OBJ_NAME
我只是想获得" DESCRIP"," CATEGORY","信息"从master_setpoints_view中将其添加到我的新视图中。
有人可以帮忙吗?我在哪里陷入困境?
编辑用于创建视图{1}}的SQL代码:
master_setpoints_view