通过在 MERGE 语句中指定OPTION (<query_hint>)子句,可以强制使用某种特定联接。 建议不要将哈希联接用作 MERGE 语句的查询提示,因为该联接类型不使用索引。 有关参数化的最佳做法 如果在没有参数的情况下执行 SELECT 、 INSERT 、 UPDATE 或 DELETE 语句, SQL Server 查询优化器可能会选择在内部参数化语句。 也...
If a SELECT, INSERT, UPDATE, or DELETE statement is executed without parameters, the SQL Server query optimizer might choose to parameterize the statement internally. This means that any literal values that are contained in the query are substituted with parameters. For example, the statementINSERT...
'Promotion') ) AS src(NewName, NewReasonType) ON tgt.Name = src.NewName WHEN MATCHED THEN UPDATE SET ReasonType = src.NewReasonType WHEN NOT MATCHED BY TARGET THEN INSERT (Name, ReasonType) VALUES (NewName, NewReasonType) OUTPUT $action INTO @SummaryOfChanges; -- Query the results of...
If a SELECT, INSERT, UPDATE, or DELETE statement is executed without parameters, the SQL Server query optimizer might choose to parameterize the statement internally. This means that any literal values that are contained in the query are substituted with parameters. For example, the statement ...
If a SELECT, INSERT, UPDATE, or DELETE statement is executed without parameters, the SQL Server query optimizer might choose to parameterize the statement internally. This means that any literal values that are contained in the query are substituted with parameters. For example, the statementINSERT...
If a SELECT, INSERT, UPDATE, or DELETE statement is executed without parameters, the SQL Server query optimizer might choose to parameterize the statement internally. This means that any literal values that are contained in the query are substituted with parameters. For example, the statementINSERT...
PrepareTextSqlCommand(SQL_PernissionReRoleModuleCreate); 35 cmd.AddParam("@roleId", roleId); 36 var param = cmd.Parameters.AddWithValue("@tvp", tblData); 37 38 39 param.SqlDbType = SqlDbType.Structured; 40 param.TypeName = "dbo.ReRoleModule"; 41 return cmd.ExecuteWrapNonQuery(); 42 ...
AND TARGET_TBL_NAME !='query' AND TABLEORSQL='sql' AND DB_TYPE=0 6.循环: Declare @i INT SET @i = 5001 WHILE @i <50000 Begin INSERT INTO s_student (id) VALUES (@i) SET@i=@i+1 END 7.查询某个表有多少列: SELECT COUNT(1) ...
通过在 MERGE 语句中指定 OPTION (<query_hint>) 子句,可以强制使用某种特定联接。 建议不要将哈希联接用作 MERGE 语句的查询提示,因为该联接类型不使用索引。 有关参数化的最佳做法 如果在没有参数的情况下执行 SELECT 、 INSERT 、 UPDATE 或 DELETE 语句, SQL Server 查询优化器可能会选择在内部参数化语句。
值為 0 表示SQL Server 驗證 (預設),而值為 1 則表示 Windows 驗證模式。 -QueryTimeOut query_time_out_seconds 這是查詢逾時之前的秒數。預設為 300 秒。 此外,當這個值大於 1800 時,合併代理程式也會使用 QueryTimeout 的值來決定等候資料分割快照集產生的時間長度。 -SrcThreads number_of_source_...