In MySQL and Oracle, the boundary and range of between and precautions when querying the date

About Between The operator

The operator BETWEEN … AND Data range between two values will be selected . These values can be numerical 、 Text or date .

grammar

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        SELECT column_name(s)
        
FROM table_name
        
WHERE column_name
        
BETWEEN value1 AND value2
       
       

        
1.
        
2.
        
3.
        
4.
       

matters needing attention

For appeals SQL Different database pairs BETWEEN…AND Operators are handled differently . There are mainly three situations ,

1. 1. 
      
2. Query out "value1" and “value2” Data between , But does not include “value1” and “value2”
3. Some databases list items between “value1” and “value2” Between and including “value1” and “value2” The data of （ such as MQL,ORACLE）
4. Other databases will list between “value1” and “value2” Data between , Include “value1” , But does not include “value2” .
   1. 
      

Oracle and mysql Of between The boundary of the , Range

For the following table test1 Yes 9 Data

Conclusion

between The scope of the ： Include boundary values on both sides

eg： id between 3 and 7 Equivalence and id >=3 and id<=7

not between The scope of the ： No boundary value

eg：id not between 3 and 7 Equivalence and id < 3 or id>7

Mysql of use between…and… Precautions when querying date

select count(1) from user where regist_date between ‘2017-07-25 00:00:00’ and ‘2017-07-25 24:00:00’;

This article sql The query result of the statement is 0. In fact, the database has a piece of data that meets the query criteria .

The reason for the error ：2017-07-25 24:00:00 evening 24 Point is the next day 00 spot 2017-07-26 00:00:00, The database does not recognize 24 Point information ; Change to the next day 00 Click to find the correct result .

hold between…and… Switch to >= <= Can recognize