SQL命令未正确结束或标识符无效

Question

无法确定此查询导致异常的原因。任何帮助表示赞赏。

ORA-00933：SQL命令未正确结束

SELECT COUNT(sd.URI) AS OrchCount FROM SDETAIL AS sd, ORCH_ASSOC AS orch WHERE sd.uri=orch.OPERATION_ AND sd.LEVEL='OrchA'

SELECT COUNT(SDETAIL.URI) AS OrchCount FROM SDETAIL WHERE SDETAIL.URI=ORCH_ASSOC.OPERATION_ AND SDETAIL.COMPONENTLEVEL='OrchA'

ORA-00904：“ORCH_ASSOC”。“OPERATION_”：标识符无效

Answer 1

AS关键字仅用于分配列别名，而不是表：

FROM SDETAIL AS sd, ORCH_ASSOC AS orch

你可以省略AS，它应该可以正常工作：

FROM SDETAIL sd, ORCH_ASSOC orch

Answer 2

@clav对ORA-00904是正确的。至于ORA-00933，那是因为你这样做了：

... FROM SDETAIL AS sd

改为执行此操作（不是“as”）：

... FROM SDETAIL sd