用oracle分隔全名

Question

我需要弄清楚如何将我的“名称”字段显示为我的查询中单独的“名字”和“姓氏”字段。这是我的数据：

set linesize 250

drop table homework1data;

CREATE TABLE homework1data (
  name VARCHAR2(30),

  address VARCHAR2(30),

  location VARCHAR2(30),

  zip VARCHAR2(10)
  );

INSERT INTO Homework1Data(Name, Address, Location, Zip) 
VALUES('Ferguson, Shawn M.', '1940 Fountainview Court', 'Reynoldsburg, Ohio', '43068');

INSERT INTO Homework1Data(Name, Address, Location, Zip) 
VALUES('Phillips, George', '19 Pleasant St.', 'Columbus, OH', '43231');

INSERT INTO Homework1Data(Name, Address, Location, Zip) 
VALUES('Thompson, Mary', '200 E. Main St.', 'Columbus, Oh', '43215');

INSERT INTO Homework1Data(Name, Address, Location, Zip) 
VALUES('Swatson, Robert', '584 Yellowstone Dr.', 'Westerville, OH', '43081');

INSERT INTO Homework1Data(Name, Address, Location, Zip) 
VALUES('Banks, Heather T.', '19 Pleasant St.', 'Columbus, Ohio', '43231');

我想我需要使用带有LTRIM和RTRIM的select语句，但不确定如何这样做

更新

我这样做是为了打破我的领域：

SELECT substr(name, 1, instr(name, ',')) "Last Name",substr(name, instr(name, ' ', 1)) "First Name", address,substr(location, 1, instr(location, ',')) "City",substr(location, instr(location, ' ', 1)) "State", zip 
FROM homework1data
ORDER BY zip, "Last Name" , "First Name"; 

但是现在我的查询报告在每列之间有太多空间，因此您必须使用滚动条来查看最后一个字段。这可调吗？尝试更改行和页面大小但未成功。

另外，刚才意识到由于某些原因我的所有行都有重复（可以在截图中看到），给我双倍的一切。不确定这是怎么发生的？

Answer 1

试试这个：

SELECT
    SUBSTRING_INDEX(name, ',', 1) AS FirstName,
    SUBSTRING_INDEX(name, ',', -1) AS LastName,
    address,
    SUBSTRING_INDEX(location, ',', 1) AS State,
    SUBSTRING_INDEX(location, ',', -1) AS City,
    zip
FROM homework1data

Answer 2

在Oracle SQL中，您可以使用如此强大的工具作为正则表达式：

SELECT 
    REGEXP_SUBSTR (name, '^\w+') as first_name,
    REGEXP_SUBSTR (name, '\w+$') as last_name
FROM
    homework1data