将表中数据和并(MERGE) 控制事务(TRANSACTION) 二、DML 可以在下列条件下执行: 向表中插入数据 修改现存数据 删除现存数据 事务是由完成若干项工作的DML语句组成的。 三、插入数据 INSERT 语句语法: INSERT INTO table [(column [, column...])] VALUES (value [, value...]); 使用这种语法一次只能向表中...
merge_not_matched>] [WHENNOTMATCHEDBYSOURCE[AND<clause_search_condition>]THEN<merge_matched>] [ ...n ] [<output_clause>] [OPTION(<query_hint>[ ,...n ] ) ] ;<target_table>::={ [database_name.schema_name. |schema_name. ] [ [AS]target_table] | @variable [ [AS]target_table]...
] [ [ AS ] target_table ] | @variable [ [ AS ] target_table ] | common_table_expression_name [ [ AS ] target_table ] } <merge_hint>::= { { [ <table_hint_limited> [ ,...n ] ] [ [ , ] { INDEX ( index_val [ ,...n ] ) | INDEX = index_val }] } } <merge_...
merge_not_matched>] [WHENNOTMATCHEDBYSOURCE[AND<clause_search_condition>]THEN<merge_matched>] [ ...n ] [<output_clause>] [OPTION(<query_hint>[ ,...n ] ) ] ;<target_table>::={ [database_name.schema_name. |schema_name. ] [ [AS]target_table] | @variable [ [AS]target_table]...
CREATE FUNCTION MergeByColumn ( -- Add the parameters for the function here @Area nvarchar(30) ) RETURNS nvarchar(500) AS BEGIN -- Declare the return variable here DECLARE @NC nvarchar(500) -- Add the T-SQL statements to compute the return value here ...
将表中数据和并(MERGE) 控制事务(TRANSACTION) 二、DML可以在下列条件下执行: 向表中插入数据 修改现存数据 删除现存数据 事务是由完成若干项工作的DML语句组成的。 三、插入数据 INSERT语句语法: INSERTINTOtable[(column [, column...])] VALUES(value[, value...]); ...
从执行计划上看,SQL语句使用了索引合并(type=index_merge),如果不想该sql使用索引合并,则可以通过SET_VAR进行控制。 greatsql>explainSELECT/*+ SET_VAR(optimizer_switch='index_merge=off') */empno,ename,deptnoFROMempWHEREdeptno=10orename='CLARK'; ...
sqlBulkMerge --dataTable(DataTable) --connection(DbConnection) --tablename(String) [--batchsize(Numeric)] [--mappings(String)] [--timeout(TimeSpan)] (Boolean)=value 依赖关系 您必须创建具有有效连接字符串的数据库连接。 根据您使用的数据库管理系统 (DBMS),使用以下命令: ...
] [ [ AS ] target_table ] | @variable [ [ AS ] target_table ] | common_table_expression_name [ [ AS ] target_table ] } <merge_hint>::= { { [ <table_hint_limited> [ ,...n ] ] [ [ , ] { INDEX ( index_val [ ,...n ] ) | INDEX = index_val }] } } <merge_...
[AS]table_alias] |OPENXML<openxml_clause>|derived_table[ [AS]table_alias] [ (column_alias[ , ...n ] ) ] |<joined_table>|<pivoted_table>|<unpivoted_table>| @variable [ [AS]table_alias] | @variable.function_call( expression [ , ...n ] ) [ [AS]table_alias] [ (column_...