posrgresql/mysql:在linux中提取数据以增量方式添加到原始文件中?
在linux中,如何从posrgresql/mysql中选择数据添加到原始文件/csv中 原始文件/csv:posrgresql/mysql:在linux中提取数据以增量方式添加到原始文件中?,mysql,postgresql,Mysql,Postgresql,在linux中,如何从posrgresql/mysql中选择数据添加到原始文件/csv中 原始文件/csv: +------+------+------+ | col1 | col2 | col3 | +------+------+------+ | a | 1 | A | | b | 2 | B | | c | 3 | C | +------+------+------+ +------+------+------+ | col1 | c
+------+------+------+
| col1 | col2 | col3 |
+------+------+------+
| a | 1 | A |
| b | 2 | B |
| c | 3 | C |
+------+------+------+
+------+------+------+
| col1 | col2 | col3 |
+------+------+------+
| a | 1 | A |
| b | 2 | B |
| c | 3 | C |
| d | 4 | D |
+------+------+------+
从表格A中选择*
+------+------+------+
| col1 | col2 | col3 |
+------+------+------+
| d | 4 | D |
+------+------+------+
在文件/csv上添加选定行:
+------+------+------+
| col1 | col2 | col3 |
+------+------+------+
| a | 1 | A |
| b | 2 | B |
| c | 3 | C |
+------+------+------+
+------+------+------+
| col1 | col2 | col3 |
+------+------+------+
| a | 1 | A |
| b | 2 | B |
| c | 3 | C |
| d | 4 | D |
+------+------+------+
您想使用mysql或postgresl或两者都添加数据吗?他们中的任何一个都很好,但最好使用postgresql@KKK