你当然可以有多个条件HAVING从句（与多重从句相对）HAVING条款）：
WHERE clause is used to filter the data in a table on basis of a given condition. Below is a simple TSQL statement’s syntax with a WHERE clause. In the above TSQL statement, there are different clauses used to fetch data from a table. WHERE clause comes after doing the select statemen...
The HAVING clause was added to SQL because the WHERE keyword could not be used with aggregate functions. 在SQL 中增加 HAVING 子句原因是,WHERE 关键字无法与合计函数一起使用。 Having syntax: SELECT column_name(s) FROM table_name WHERE condition GROUP BY column_name(s) HAVING condition ORDER BY...
支援Multiple Active Result Sets (MARS)。 如果 MARS 工作階段在有作用中結果集的情況下,發出資料修改陳述式 (例如 INSERTUPDATE或DELETE),就會為修改陳述式所影響的資料列建立版本。 支援指定 ONLINE 選項的索引作業。 支援以資料列版本設定為基礎的交易隔離等級: 新的READ COMMITTED 隔離等級實作...
Cross-database referential integrity must be implemented through triggers. For more information, see CREATE TRIGGER. FOREIGN KEY constraints can reference another column in the same table. This is referred to as a self-reference. The REFERENCES clause of a column-level FOREIGN KEY constraint can ...
To reduce contention on a single lock resource, lock partitioning splits a single lock resource into multiple lock resources to distribute the load across multiple spinlocks. Memory This is used to store the lock resource structures. Once the spinlock is acquired, lock structures are stored in me...
Subqueries are "nested" when they appear in the WHERE clause of the parent statement. When Oracle evaluates a statement with a nested subquery, it must evaluate the subquery portion multiple times and may overlook some efficient access paths or joins. Subquery unnesting unnests and merges the ...
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Multiple sort columns can be specified. Column names must be unique. The sequence of the sort columns in theORDER BYclause defines the organization of the sorted result set. That is, the result set is sorted by the first column and then that ordered list is sorted by the second column, ...
What is the primary purpose of the SQLHAVINGclause? To filter rows based on a condition before grouping To filter groups based on an aggregate condition after grouping To order the result set in ascending or descending order To join multiple tables ...