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Summary Query en
Summary queries are compatible with the two-phase queries in Havenask. When the Havenask table is registered in Iquan, a summary table is also registered. The name of the summary table consists of the table name that is specified in the schema and the suffix. The default suffix is summary. You can change the suffix based on your business requirements. The summary table is required for summary queries.
Primary keys must be included in summary queries.
SELECT brand, price FROM phone_summary_ WHERE nid = 8 or nid = 7
SELECT brand, price FROM phone_summary_ WHERE nid IN (7, 8, 9)
In a summary query, the primary key field must be specified after a where clause. In the preceding example, the primary key field of the phone table is nid. This field is used to obtain the required data records.
If the query condition contains the primary key field, you can also use the AND operator to add other conditions. This way, the returned records are filtered.
SELECT brand, price FROM phone_summary_ WHERE nid IN (7, 8, 9) AND price < 2000