Mysql 如何选择标题标签用引号括起来但不包含正文字段的“输入到输出文件”中？

我不相信这个问题是重复的

我希望正文中的行被双引号“选择性地括起来”。数值不应包含在内。没有头球很容易做到。但是，当您使用UNION包含一个标题时，MySQL现在将每个列视为字符串类型，并将所有值括在引号中

您可以像下面这样添加一个标头以选择输出文件：

SELECT "id", "numerical_values", "string_values" #header section of csv
UNION ALL
SELECT `id`, `numerical_values`, `string_values` #body section of csv
INTO OUTFILE "/tmp/values.csv"
FIELDS TERMINATED BY "," OPTIONALLY ENCLOSED BY '"'
LINES TERMINATED BY "\n"
FROM `values_table`

同样，如果省略标题，则只有

string\u值

将被引号括起来。 对于标题，所有列都被视为字符串列，并将被封闭

我试过这个：

SELECT '"', "id", ',"', "numerical_values", ',"', "string_values", '"' 
#added quotes/commas to header
UNION ALL
SELECT `id`, ',', `numerical_values`, ',"', `string_values`, '"'
#added commas, and add quotes around string_values
INTO OUTFILE "/tmp/values.csv"
FIELDS TERMINATED BY "" ENCLOSED BY '' #empty values for fields terminated and enclosed
# empty because manually selected in query
LINES TERMINATED BY "\n" 
FROM `values_table`

我原以为这样行得通，但最终我得到了一堆额外的空白。这是我刚刚用第二种方法创建的一个文件。标题行在“string7”处结束。第一行数据在“207”之后结束。我只是把第三行的一部分放进去

"         num1","                                          string1","       num2","                                          string2","       num3","                                                                        string3","       num4","                                                                        string4","       num5","                                                                        string5","       num6","                                                                        string6","      string7""
33.95     ," 1023                                         ",  7.50      ,"  207-1023                                     ",  26.95     ,"2 1023                                                                     ",23.00     ,"3Wx4Hx4D                                                                   ",19.00     ,"1023                                                                       ",  0.00      ,"UPC: 123456789012                                                          "," 207      "       
40.95     ," 1058                                         ",  9.00      ,

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工作完美。我希望有一个更简单的方法，但这样做的工作。谢谢@eggyal，thx，使我不必再编写单独的脚本。感谢您的提问，@buttle butkus的可能副本很好地找到了这个问题的答案。@AdrianBR这个问题已被浏览10918次，所以我很高兴它最终帮助了某人！；）

SELECT '"id"', '"numerical_values"', '"string_values"'
UNION ALL
SELECT id, numerical_values, CONCAT('"', REPLACE(string_values, '"', '""'), '"')
INTO OUTFILE '/tmp/values.csv'
FIELDS TERMINATED BY ',' ENCLOSED BY '' ESCAPED BY '\\'
LINES TERMINATED BY '\n'
FROM values_table