XMLNAMESPACES FREE REGR_AVGX XMLPARSE FULLTEXTTABLE REGR_AVGY XMLPI FUSION REGR_COUNT XMLQUERY GENERAL REGR_INTERCEPT XMLSERIALIZE GET REGR_R2 XMLTABLE GLOBAL REGR_SLOPE XMLTEXT GO REGR_SXX XMLVALIDATE GROUPING REGR_SXY YEAR HOLD REGR_SYY ZONE
If the actual number of rows is much higher than the guessed value, performance of downstream operations can suffer.New plans will use the actual cardinality of the table variable encountered on first compilation instead of a fixed guess. For more information, seetable va...
New plans will use the actual cardinality of the table variable encountered on first compilation instead of a fixed guess. For more information, see table variable deferred compilation. For more information on query processing features enabled in database compatibility level 150, refer to What's new...
ROLLBACK [ TRAN[SACTION] tran_name ] SAVE TRAN[SACTION] tran_name 七.存储过程实例 简单图书馆管理系统示例 --简单图书馆管理系统 --创建reader表 CREATE TABLE reader ( reader_id INT IDENTITY(1,1) NOT NULL, reader_email VARCHAR(120) NOT NULL, reader_name NVARCHAR(16) NULL, reader_password ...
ROUTINE_ALREADY_EXISTS、 VARIABLE_ALREADY_EXISTS 42734 偵測到重複的參數名稱、SQL 變數名稱、標籤或條件名稱。 COLUMN_MASKS_DUPLICATE_USING_COLUMN_NAME、COLUMN_MASKS_USING_COLUMN_NAME_SAME_AS_TARGET_COLUMN、DUPLICATE_ROUTINE_PARAMETER_NAMES、ROW_LEVEL_SECURITY_DUPLICATE_COLUMN_NAME 4274K 叫用例程時,無效地...
The column is computed from an expression that uses other columns in the same table. For example, a computed column can have the definition: cost AS price * qty. The expression can be a noncomputed column name, constant, function, variable, and any combination of these connected by one or...
第一部分:基础——增删查改【第一章】做好准备 Getting Started (时长25分钟)【第二章】在单一表格中检索数据 Retrieving Data From a Single Table (时长53分钟)【第三章】在多张表格中检索数据 Retrieving Data From Multiple Tables (时长1小时2分)【第四章】插入、更新和删除数据 Inserting, Updating, an...
The total number of I/Os needed to perform a full table scan depends on such factors as the size of the table, the multiblock read count, and whether parallel execution is being utilized for the operation. DB_FILE_NAME_CONVERT Parameter type String Syntax DB_FILE_NAME_CONVERT = [...
SAVE {TRAN | TRANSACTION} {savepoint_name | @savepoint_variable} ROLLBACK TRANSACTION {savepoint_name | @savepoint_variable} 【例10.3】定义一个事务,向course表中添加一条记录,并设置保存点。然后再删除该记录,并回滚到事务的保存点,提交事务。 BEGIN TRAN; INSERT INTO course VALUES('c05139','统一建模...
ALTER TABLE modifies a table definition by altering, adding, or dropping columns and constraints. ALTER TABLE also reassigns and rebuilds partitions, or disables and enables constraints and triggers.