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[Communication] Usage of having in SQL

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Posted on 4/16/2015 6:05:23 PM | | |

The usage of having is similar to the usage of WHERE, but there are three differences
1. HAVING is only used for GROUP BY (group statistical statement),
2. WHERE is used to filter queries in the initial table, and HAVING is used to query in WHERE and GROUP BY results.
3. HAVING can use aggregation functions, but not WHERE faces.
The following statement counts users with the name "Li" (defined by the WHERE clause) in the user table and who appear more than once (having defined by the aggregation function COUNT(1)).
SELECT USERCODE,username=max(username),times=count(1) from usertable where username like 'Li%' group by usercode having count(1)>1




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