Why is it that when executing a SUM query in the code, the query with round (), is fast, the query without round (), is slow, and the execution speed is fast in Navicat?
1, xml file, add round ()
sql:
2xmlround
sql:
Why is it that when executing a SUM query in the code, the query with round (), is fast, the query without round (), is slow, and the execution speed is fast in Navicat?
1, xml file, add round ()
sql:
2xmlround
sql:
explain sql. What's the difference between taking a look at the execution plan?
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