Sql 当我有条件时添加唯一列

我有一张桌子，这是桌子的字段

project_labor
PROJECT_NO, LABOR_ID, STATUS

“状态”字段有两个值（完成或未完成）
如果状态值为（完成），则可以重复人工id

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但如果状态值为（未完成），则人工id必须是唯一的

您可以使用函数索引（默认情况下，跳过单列索引的值）：

完整脚本：

CREATE TABLE project_labor(PROJECT_NO INT, LABOR_ID INT, STATUS VARCHAR2(10));

CREATE UNIQUE INDEX IX_name 
ON project_labor (CASE WHEN STATUS='complete' THEN NULL ELSE labor_id END);

INSERT INTO project_labor(project_no,status,labor_id) VALUES(1, 'uncomplete', 1);
INSERT INTO project_labor(project_no,status,labor_id) VALUES(2, 'uncomplete', 1);
-- ORA-00001: unique constraint (IX_NAME) violated

INSERT INTO project_labor(project_no,status,labor_id) VALUES(3, 'complete', 2)
INSERT INTO project_labor(project_no,status,labor_id) VALUES(4, 'complete', 2)

SELECT * FROM project_labor

它相当于其他RDBMS的部分索引：

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//

到目前为止，你都试过什么，你能把它贴出来吗\

CREATE TABLE project_labor(PROJECT_NO INT, LABOR_ID INT, STATUS VARCHAR2(10));

CREATE UNIQUE INDEX IX_name 
ON project_labor (CASE WHEN STATUS='complete' THEN NULL ELSE labor_id END);

INSERT INTO project_labor(project_no,status,labor_id) VALUES(1, 'uncomplete', 1);
INSERT INTO project_labor(project_no,status,labor_id) VALUES(2, 'uncomplete', 1);
-- ORA-00001: unique constraint (IX_NAME) violated

INSERT INTO project_labor(project_no,status,labor_id) VALUES(3, 'complete', 2)
INSERT INTO project_labor(project_no,status,labor_id) VALUES(4, 'complete', 2)

SELECT * FROM project_labor