TableVariableTransactionsDoNotSupportParallelNestedTransaction 表变量事务不支持并行嵌套事务。 DMLQueryReturnsOutputToClient DML 查询将输出返回到客户端,并且不可并行化。 MixedSerialAndParallelOnlineIndexBuildNotSupported 单个联机索引生成
| QUERYTRACEON <integer_value> | RECOMPILE | ROBUST PLAN | USE HINT ( 'hint_name' [ , ...n ] ) | USE PLAN N'<xml_plan>' | TABLE HINT ( <exposed_object_name> [ , <table_hint> [ [ , ] ...n ] ] ) | FOR TIMESTAMP AS OF '<point_in_time>' } <table_hint> ::= ...
After connecting to your data, double-click the New Custom SQL option on the Data Source page. Type or paste the query into the text box. The query must be a single SELECT* statement. When finished, click OK. When you click OK, the query runs and the custom SQL query table appears...
语法:ALTER VIEW 视图名称 AS SQL语句 mysql> alter view teacher_view as select * from course where cid>3; Query OK, 0 rows affected (0.04 sec) mysql> select * from teacher_view; +---+---+---+ | cid | cname | teacher_id | +---+---+---+ | 4 | xxx | 2 | | 5 | yyy...
QueryStmt: Abstract base class for any statement that returns results via a list of result expressions; 在解析出了具体的StatementBase之后(上述例子中就是SelectStmt),Impala接着会构造对应的Analyer,相关的类如下所示: 同样,我们截取部分代码中的注释来看一看: ...
S05QueryUpdateSample 3个例子,Query完成update操作 S06SelectSample 14个例子,SQLManager 查询API S07InsertSample 8个例子,SQLManager 插入新数据API,主键生成 S08UpdateSample 6个例子,更新数据 S09JsonMappingSample 5个例子, json配置映射 S10FetchSample 2个例子,关系映射 ...
The SQL query below shows a list of tables sorted by the largest tables first. For each table, the indexes in the table are shown. For each index it shows when the index was last used. The query is designed to collect various pieces of information in one place, and give...
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 N...
sql的行转列(PIVOT)与列转行(UNPIVOT) 在做数据统计的时候,行转列,列转行是经常碰到的问题。case when方式太麻烦了,而且可扩展性不强,可以使用 PIVOT,UNPIVOT比较快速实现行转列,列转行,而且可扩展性强 一、行转列 1、测试数据准备 CREATE TABLE [St
( LOCATION ='sqlserver://SqlServer',-- PUSHDOWN = ON | OFF,CREDENTIAL = SQLServerCredentials ); GOCREATESCHEMAsqlserver; GO/* LOCATION: sql server table/view in 'database_name.schema_name.object_name' format * DATA_SOURCE: the external data source, created above. */CREATEEXTERNALTABLE...