copy table from ' .csv' with delimiter ',' null as ''

To copy a table from a CSV file with a delimiter of ',' and treating null values as empty strings, you can use the `COPY` command in PostgreSQL. Here is an example:

COPY your_table_name FROM 'your_file.csv' DELIMITER ',' CSV NULL AS '';

Make sure to replace `your_table_name` with the name of the table you want to copy the data into, and `your_file.csv` with the path to your CSV file.

Note that this command assumes you are using PostgreSQL as your database management system. The syntax may vary for different database systems.

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copy table from ' .csv' with delimiter ',' null as '';

To copy a table from a CSV file with a comma delimiter and treating empty fields as null, you can use the following command in most SQL databases:

COPY table_name FROM 'path/to/file.csv' DELIMITER ',' NULL AS '';

Replace `table_name` with the name of the table you want to copy the data into, and `'path/to/file.csv'` with the actual file path of your CSV file. The `DELIMITER ','` specifies that the fields in the CSV file are separated by commas. The `NULL AS ''` statement instructs the database to treat empty fields as null values.

Please note that the exact syntax may vary slightly depending on the database you are using.

pgsql 使用copy table from ' 路径.csv' with delimiter ',' null as ''

你可以使用 PostgreSQL 中的 COPY 命令来将数据从一个 CSV 文件导入到表中。命令的语法如下：

COPY table_name FROM '文件路径' WITH (FORMAT csv, DELIMITER ',', NULL '', HEADER);

其中，`table_name` 是要导入数据的目标表的名称，`文件路径` 是包含要导入数据的 CSV 文件的路径。`FORMAT csv` 表示文件格式为 CSV。`DELIMITER ','` 指定 CSV 文件中字段的分隔符为逗号。`NULL ''` 表示将空字段解析为空字符串。`HEADER` 表示 CSV 文件的第一行包含列名。

请确保数据库用户具有足够的权限来读取文件和写入目标表。