Come on, insist on charging

CodePudding user response:

Good start, come on!

CodePudding user response:

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CodePudding user response:

6.1.4 null sequence that must pay attention to the building Lord, different database (DBMS) may have different sorting result;
Or can use some database supports the syntax of the
The order by crosstab first
The order by crosstab last
To specify,