SQL-将单列划分为多列 [英] SQL - Divide single column in multiple columns

问题描述

我有以下SQL问题:

如何使用SELECT命令将一列(内部文本)划分为两个带有拆分文本的单独列?

How to divide a column (text inside) using the SELECT command into two separate columns with split text?

我需要使用空格字符分隔文本数据. 我知道最好举一个例子来简化它.所以:

I need to separate the text-data, using the space character. I know it is better to put an example to make it easy. So:

SELECT COLUMN_A FROM TABLE1

输出:

COLUMN_A
-----------
LORE IPSUM

所需的输出:

COLUMN_A   COLUMN_B
---------  ----------
LORE       IPSUM

谢谢大家的帮助.

推荐答案

取决于数据的一致性-假设要在第一列和第二列中出现的内容之间用一个空格隔开:

Depends on the consistency of the data - assuming a single space is the separator between what you want to appear in column one vs two:

WITH TEST_DATA AS
  (SELECT 'LOREM IPSUM' COLUMN_A FROM DUAL)

SELECT SUBSTR(t.COLUMN_A, 1, INSTR(t.COLUMN_A, ' ')-1) AS COLUMN_A,
       SUBSTR(t.COLUMN_A, INSTR(t.COLUMN_A, ' ')+1) AS COLUMN_B
FROM test_data T;

您还可以在REGEX中使用以下查询:

You can also use below query with REGEX:

WITH TEST_DATA AS
   (SELECT 'LOREM IPSUM' COLUMN_A FROM DUAL)

SELECT REGEXP_SUBSTR(t.COLUMN_A, '[^ ]+', 1, 1) COLUMN_A,
       REGEXP_SUBSTR(t.COLUMN_A, '[^ ]+', 1, 2) COLUMN_B
FROM test_data T;

Oracle 10g +具有正则表达式支持，根据您需要解决的情况提供更大的灵活性.它还有一个正则表达式子字符串方法...

Oracle 10g+ has regex support, allowing more flexibility depending on the situation you need to solve. It also has a regex substring method...

3个字分割:

WITH TEST_DATA AS
  (SELECT 'LOREM IPSUM DIMSUM' COLUMN_A FROM DUAL)

 SELECT REGEXP_SUBSTR(t.COLUMN_A, '[^ ]+', 1, 1) COLUMN_A,
     REGEXP_SUBSTR(t.COLUMN_A, '[^ ]+', 1, 2) COLUMN_B,
     REGEXP_SUBSTR(t.COLUMN_A, '[^ ]+', 2, 3) COLUMN_C
 FROM test_data T;

参考:

• SUBSTR
• INSTR

• SUBSTR
• INSTR

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