问题
I want to store a field which stores channel clicks per day( increasing every second and updated in a day) into MySQL DB table. What datatype should I assign to the column keeping in mind that it can even be less than 100 or can even exceed a million.
回答1:
MySQL Integer Types (Exact Value):
Fixed-Point Types (Exact Value) - DECIMAL, NUMERIC:
In standard SQL, the syntax DECIMAL(M) is equivalent to DECIMAL(M,0). Similarly, the syntax DECIMAL is equivalent to DECIMAL(M,0), where the implementation is permitted to decide the value of M. MySQL supports both of these variant forms of DECIMAL syntax. The default value of M is 10.
If the scale is 0, DECIMAL values contain no decimal point or fractional part.
The maximum number of digits for DECIMAL is 65, but the actual range for a given DECIMAL column can be constrained by the precision or scale for a given column. When such a column is assigned a value with more digits following the decimal point than are permitted by the specified scale, the value is converted to that scale. (The precise behavior is operating system-specific, but generally the effect is truncation to the permissible number of digits.)
Storage Requirements:
来源：https://stackoverflow.com/questions/39588762/mysql-best-data-type-for-large-numbers