mysql>showvariableslike'%slow_query_log%';+---+---+|Variable_name|Value|+---+---+|slow_query_log|OFF||slow_query_log_file|/var/lib/mysql/iZwz9iiwojnmkotgajxjlqZ-slow.log|+---+---
[ASC | DESC], ...[WITH ROLLUP]][LIMIT {[offset,]row_count|row_count OFFSET offset}][INTO OUTFILE 'file_name' [CHARACTER SET charset_name]export_options|INTODUMPFILE'file_name'|INTOvar_name[, var_name]][FOR {UPDATE | SHARE} [OF tbl_name [, tbl_name]...][NOWAIT | SKIP LOCKED...
SELECT BusinessEntityID, VacationHours FROM HumanResources.Employee WHERE BusinessEntityID = 4; -- This statement, which caused the snapshot transaction -- to fail, will succeed with read-committed using row versioning. UPDATE HumanResources.Employee SET SickLeaveHours = SickLeaveHours - ...
可以使用 sql:max-depth 批注指定递归的深度。在该特定示例中,若要指定 sql:max-depth 的值,必须知道在该公司中其管理层次结构的深度。 展开表 注意 该架构指定 sql:limit-field 批注,但不指定 sql:limit-value 批注。这会使得所生成的层次结构的顶级节点仅为那些不向任何人报告的雇员。(ReportsTo 为 NULL。
WITH EXECUTE PLAN WRITETEXT 此外,ISO 标准定义了保留关键字列表。不要使用 ISO 保留关键字作为对象名和标识符。ODBC 保留关键字列表(如下表所示)与 ISO 保留关键字列表相同。 注意 ISO 标准保留关键字有时可能比 SQL Server 限制更多,有时则更少。例如,ISO 保留关键字列表包含 INT。SQL Server 不必将此区分为...
The indexed view remains condensed if there's a direct reference to the view in the query's SELECT part. The view also remains condensed if you specify WITH (NOEXPAND) or WITH (NOEXPAND, INDEX( <index_value> [ , *...n* ] ) ). For more information about the query hint ...
col_name,...)]ON((col_value,col_value,...),(col_value,col_value,...),...)[STOREDASDIRECTORIES][[ROWFORMATrow_format][STOREDASfile_format]|STOREDBY'storage.handler.class.name'[WITHSERDEPROPERTIES(...)]][LOCATIONhdfs_path][TBLPROPERTIES(property_name=property_value,...)][ASselect_...
SQL20263N 嘗試更新視圖 view-name1 無效,因為視圖 view-name2 已定義 WITH ROW MOVEMENT。 解說 試圖更新 view-name1 失敗,因為它直接或間接包含涉及視圖 view-name2(利用 WITH ROW MOVEMENT 子句定義)的 UNION ALL 作業。 無法執行陳述式。 使用者回應 捨棄視圖 view-name2,並重新建立它,不包含 WITH ROW...
SELECT 语句 SELECT[predicate]{*|table.*|[table.]field [,[table.]field2[,...]]} [AS alias1 [,alias2[,...]]] FROM tableexpression [,...][IN externaldatabase] [WHERE...] [GROUP BY...] [HAVING...] [ORDER BY...] [WITH OWNERACCESS OPTION] ...
The table is so small that it is faster to perform a table scan than to bother with a key lookup. This is common for tables with fewer than 10 rows and a short row length.(不符合当前查询场景) There are no usable restrictions in the ON or WHERE clause for indexed columns.(不符合当前...