Question

我的数据库中有2个表。

表＃1

-------------------------------------------------------------------------
| name | family | phone | email | gender | phone2 | address | birthdate |
-------------------------------------------------------------------------

表＃2

-----------------------------------------
| gender | address | phone | birthdate |
-----------------------------------------

表＃1中的

列地址和phone2为空，列gender和birthdate值与表＃2相同。

当性别和出生日期在每一行中相同时，如何从表＃2中读取数据并使用表＃2地址和电话列中的值更新表＃1中的地址和phone2？

例如：这是表＃1中的一些数据

-------------------------------------------------------------------------
| name | family | phone | email | gender | phone2 | address | birthdate |
-------------------------------------------------------------------------
| john | doe    | 12345| t@t.com| Male  |         |         | 1980-01-01|
-------------------------------------------------------------------------
| mike | clark  | 65432| x@y.com| Male  |         |         | 1990-01-01|
-------------------------------------------------------------------------
| Sara | King   | 875465| a@b.com|Female|         |         | 1970-01-01|
-------------------------------------------------------------------------

以下是表＃2中的一些数据

-----------------------------------------
| gender | address | phone | birthdate  |
-----------------------------------------
| Male   | 1704test|0457852|1980-01-01  |
-----------------------------------------
| Female | 1705abcs|0986532|1970-01-01  |
-----------------------------------------
| Male   | 1602cyzd|0326589|1990-01-01  |
-----------------------------------------

我想用表＃2中的数据更新表＃1并检查性别和生日，并使表＃1像

-------------------------------------------------------------------------
| name | family | phone | email | gender | phone2 | address | birthdate |
-------------------------------------------------------------------------
| john | doe    | 12345| t@t.com| Male   |0457852 |1704test | 1980-01-01|
-------------------------------------------------------------------------
| mike | clark  | 65432| x@y.com| Male   |0326589  |1602cyzd| 1990-01-01|
-------------------------------------------------------------------------
| Sara | King   | 875465| a@b.com|Female |0986532  |1705abcs| 1970-01-01|
-------------------------------------------------------------------------

我该怎么做？

Answer 1

您可以在更新声明中使用JOIN。

UPDATE t1
SET t1.phone2 = t2.phone, t1.address = t2.address
FROM table1 t1
JOIN table2 t2 on t1.gender = t2.gender and t1.birthdate = t2.birthdate

如何检查和更新表＃2中的表＃1数据？

1 个答案: