AggregateAvg avg(col).

AggregateCount count(col).

AggregateMax max(col).

AggregateMin min(col).

AggregateQuery is a helper function to execute the aggregate query and return the result.

AggregateSum sum(col).

BuildDelete work as its name says.

BuildInsert work as its name says.

BuildInsertIgnore work as its name says.

BuildInsertOnDuplicateKey builds an INSERT ..

BuildReplaceInsert work as its name says.

BuildSelect work as its name says.

BuildUpdate work as its name says.

NamedQuery is used for expressing complex query.

OmitEmpty is a helper function to clear where map zero value.

IsNotNull the same as `is not null`.

IsNull the same as `is null`.

ErrUnsupportedOperator reports there's unsupported operators in where-condition.

AggregateSymbleBuilder need to be implemented so that executor can get what should be put into `select Symble() from xxx where yyy`.

Comparable requires type implements the Build method.

ResultResolver is a helper for retrieving data caller should know the type and call the responding method.

Eq means equal(=).

Gt means greater than(>).

Gte means greater than or equal(>=).

In means in.

Like means like.

Lt means less than(<).

Lte means less than or equal(<=).

Ne means Not Equal(!=).

NotIn means not in.

NullType is the NULL type in mysql.