带有两个标识符的Oracle条件索引
可以在两列上创建条件索引吗带有两个标识符的Oracle条件索引,oracle,indexing,Oracle,Indexing,可以在两列上创建条件索引吗 CREATE UNIQUE INDEX idx_dup_wfc ON WF_WORKFLOW_CLASS (CASE WHEN is_active = 1 THEN (NAME, DEPT_OWNER) ELSE NULL END) 返回ORA-00906:缺少左括号,但以下操作有效 CREATE UNIQUE INDEX idx_dup_wfc ON WF_WORKFLOW_CLASS (CASE WHEN
CREATE UNIQUE INDEX idx_dup_wfc
ON WF_WORKFLOW_CLASS (CASE WHEN is_active = 1
THEN (NAME, DEPT_OWNER)
ELSE NULL
END)
返回ORA-00906:缺少左括号
,但以下操作有效
CREATE UNIQUE INDEX idx_dup_wfc
ON WF_WORKFLOW_CLASS (CASE WHEN is_active = 1
THEN NAME
ELSE NULL
END)
可以,但您必须为每列执行一个案例:
CREATE UNIQUE INDEX idx_dup_wfc
ON WF_WORKFLOW_CLASS
(CASE WHEN is_active = 1 THEN NAME END
,CASE WHEN is_active = 1 THEN DEPT_OWNER END
)
(代码中的ELSE是多余的)