Question

我有下面的代码，但在else部分中引发了语法错误。

INSERT INTO tbl1 ("Name") 
values 
((SELECT CASE 
           WHEN EXISTS(select "OccupationID" from "tbloccupations" where "Name" = '-') 
              THEN (select "OccupationID" from "tbloccupations" where "Name" = '-') 
           ELSE (INSERT INTO "tbloccupations" ("Name") VALUES ('-') RETURNING "OccupationID") 
           END)
);

这应该运行的实际查询感谢您的帮助：

ALTER TABLE tblcustomers DISABLE TRIGGER ALL;
INSERT INTO public.tblcustomers
("CustomerID","Surname","OtherNames","Sex","DateOfBirth","OccupationID","Residence","PostalAddress","TownID",
 "NextOfKin","NextOfKinRelationship","NextOfKinContact","EmailAddress","DateRegistered","IDTypeID","IDNumber",
 "OutPatientNo","InPatientNo","Telephone1","Telephone2","PostalCode","Note","ReferenceNo","NationalityID",
 "RegisteredAtCompanyBranchID","RegisteredBySysUID","IsActive") 
 VALUES('-2','-','-','0','12/12/2012 12:00:00 AM',
        (SELECT CASE WHEN EXISTS(select "OccupationID" from "tbloccupations" where "Name" = '-') 
         THEN(select "OccupationID" from "tbloccupations" where "Name" = '-') 
         ELSE(INSERT INTO "tbloccupations" ("Name") VALUES ('-') RETURNING "OccupationID") END),
        '-','-',
        (SELECT CASE WHEN EXISTS(select "TownID" from "tbltowns" where "Name" = '-') THEN
         (select "TownID" from "tbltowns" where "Name" = '-') 
         ELSE(INSERT INTO "tbltowns" ("Name") VALUES ('-') RETURNING "TownID") END),
        '-','-','-','-','9/10/2014 12:00:00 AM','0','-','0','0','-','-','-','-','-','0','0','0','1') 
        ON CONFLICT DO NOTHING;ALTER TABLE tblcustomers ENABLE TRIGGER ALL;

Answer 1

如果我正确理解了您的逻辑，则希望在名称为OccupationID时插入-，否则要插入-：

INSERT INTO tbl1 (Name)
SELECT CASE WHEN Name = '-' THEN OccupationID ELSE '-' END
FROM tbloccupations
RETURNING OccupationID;

我不确定您目前是否可以在VALUES子句中使用子查询，但是无论如何，您的问题更适合INSERT INTO ... SELECT。

注意：如果OccupationID列为数字，则必须使用OccupationID::text之类的字符将其转换为文本，以使CASE表达式起作用。

我如何使用大小写表达式然后在Postgres SQL中的语句的else部分中使用插入语句

1 个答案: