Question

任何人都可以解释以下语法的含义以及如果我的捐赠金额为12345.67889889，如果我只想加载12345.67，则必须在上述语法中进行哪些更改。

DONATION_AMOUNT NULLIF DONATION_AMOUNT = BLANKS DEFAULTIF DONATION_AMOUNT = 'NULL' "REGEXP_REPLACE(TRIM(:DONATION_AMOUNT),'[,/$]')",

Answer 1

您是否可以不使用CAST cast(round(DONATION_MOUNT) as numeric(x,2))，其中x是最大位数？

Answer 2

NULLIF DONATION_AMOUNT = BLANKS
  If the donation_amount field in the file is blank, set it to NULL in the table.

DEFAULTIF DONATION_AMOUNT = 'NULL'
  If the donation_amount field in the file = the string 'NULL', set it to NULL in the table.

"REGEXP_REPLACE(TRIM(:DONATION_AMOUNT),'[,/$]')"
  The TRIM() call removes blanks from either end of the string read from the file, 
then removes commas, slashes and dollar signs.

除上述规则外，要截断到2个小数位，请将其包装在REGEXP_SUBSTR（）中，该匹配匹配锚定在字符串开头的1个或多个数字，后跟一个小数点，然后是最多2个可选数字

REGEXP_SUBSTR(REGEXP_REPLACE(TRIM(:DONATION_AMOUNT),'[,/$]'), '^\d+\.\d?\d?', 1, 1)

想知道语法含义

2 个答案: