9. A device for determining criticality of a Structured Query Language (SQL) statement, comprising: a processor; and a memory coupled to the processor, wherein the memory comprises instructions which, when executed by the processor, cause the processor to: extract a plurality of elements in the SQL statement; calculate a score of the SQL statement based on a correlation relation among respective elements in the plurality of elements and base scores of the respective elements, wherein the instructions to calculate the score of the SQL statement based on a correlation relation among respective elements in the plurality of elements and base scores of the respective elements further causes the processor to: determine the score of the SQL statement as a first value in response to that the correlation relation does not exist between any two of the plurality of elements, the first value being a maximum one of the respective base scores of the plurality of elements; and determine the score of the SQL statement as a second value in response to that the correlation relation exists between at least two of the plurality of elements, the second value being greater than the maximum one of the respective base scores of the plurality of elements; and determine the criticality of the SQL statement based on the score of the SQL statement.
10. The device of claim 9 , wherein the plurality of elements include at least one of a table and a field in a database which the SQL statement is directed at, and an action to be executed by the SQL statement.