To process a SQL statement, Oracle opens a work area called aprivate SQL area. The private SQL area stores information needed to execute the SQL statement. An identifier called acursorlets you name a SQL statement, access the information in its private SQL area, and, to some extent, control...
Can we do MAX inside nested CASE Statement? Can we generate pipe delimited column through SQL query Can we optimise While Loop in sql server for large number of data? Can we pass parameters to the trigger?(Beginner) Can we RAISERROR inside MERGE Statement Can we select Bottom 1000 rows of...
支持PS 模式并行执行,PREPARE STATEMENT 让语句仅进行一次语法分析而可以被多次执行。经过 Prepare 预处理的语句只需要修改变量值即可使用,带来性能上的提升。 Hash join(in memory) 并行执行 支持Hash join(in memory) 并行执行。 子查询 derived table 单独并行执行 ...
sql_statement_recompile 擴充事件 (XEvent) 用來報告語句層級的重新編譯。 當任何類型的批次需要語句層級重新編譯時,就會發生此 XEvent。 這包括預存程序、觸發程序、特定批次和查詢。 批次可透過數種介面提交,包括 sp_executesql、動態 SQL、Prepare 方法或 Execute 方法。
The value of theCASEoperand andWHENoperands in a simpleCASEstatement can be any PL/SQL type other thanBLOB,BFILE, an object type, a PL/SQL record, an index-by-table, a varray, or a nested table. If theELSEclause is omitted, the system substitutes a default action. For aCASEstatement,...
CASE expression syntax is similar to an IF-THEN-ELSE statement. Oracle checks each condition starting from the first condition (left to right). When a particular condition is satisfied (WHEN part) the expression returns the tagged value (THEN part). If none of the conditions are matched, the...
Table 13. Class Code 20: Case Not Found for Case Statement SQLSTATE ValueMeaning 20000 The case was not found for the CASE statement. Table 14. Class Code 21: Cardinality Violation SQLSTATE ValueMeaning 21000 The result of a SELECT INTO, scalar fullselect, or subquery of a basic predicat...
SELECT TOP 20 MAX(SUBSTRING(ST.text, (QS.statement_start_offset/2) + 1, ((CASE statement_end_offset WHEN -1 THEN DATALENGTH(ST.text) ELSE QS.statement_end_offset END - QS.statement_start_offset)/2) + 1)) AS sample_statement_text ,CONVERT(DECIMAL (10,2), SUM(max_grant_kb) ...
绑定只是根据名称进行的;如果基础对象被修改、删除或替换,那么在运行时将会发现缺失的引用。Postgresql不支持同义词。 What are the table statement differences between PostgreSQL and SQL Server? Compare the table statements in PostgreSQL vs. MSSQL 中文:两种数据库在表操作中的不同...
SQL_AM_STATEMENT = 语句级别异步执行受支持。 与连接句柄关联的某些语句句柄可以处于异步模式,而同一连接上的其他语句句柄处于同步模式。SQL_AM_NONE = 不支持异步模式。 SQL_ASYNC_NOTIFICATION 3.8 一个SQLUINTEGER 值,该值指示驱动程序是否支持异步通知:SQL_ASYNC_NOTIFICATION_CAPABLE = 驱动程序支持异步执行通知。