Column names should be unique. At times, you derive the columns of temporary tables from expressions. With this, you assign a unique alias when using SELECT INTO. You will trigger an error if there’s no column name or if the name is not unique. You can do to a temporary table the s...
6: create clustered index #table_index1 on #table (empid asc ) 7: create nonclustered index #table_index2 on #table (Salary) include (Department,empid ) 8: insert into #table select S.empid,S.empname,T.deptname,S.salary from Employees s 9: inner join Departments T ON S.deptid =T...
图2-6-4 7.Find all the employees that earn more than JONES, using temporary labels to abbreviate table names. 语句: select * from emp2017303010 e where e.sal>(select e.sal from emp2017303010 e where e.ename = 'JONES'); 结果(图2-6-7): 图2-6-7Ex71.Create a new table called lo...
select name,IDENTITY(int,1,1) id into temptb from sys.tables t where name like 'tmp%' and len(name)=30 and name not like 'tmp[_]%' and not exists(select 1 from T_BAS_TEMPORARYTABLENAME where FTABLENAME=t.name) and create_date<=DATEADD(n,-5, GETDATE()) select @icount=@@RO...
# -e 执行sql语句 hive -e "select * from temp.hh_teachr_price limit 100;" # -f 执行sql脚本 hive -f /app/mydata/hh_teachr_price.sql # 服务器cli上输出文件 hive -e"set hive.cli.print.header=true; -- 显示列名 set hive.resultset.use.unique.column.names=false; -- 不显示库表前缀...
基于磁盘的 CREATE TABLE 语法: syntaxsql 复制 CREATE TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } [ AS FileTable ] ( { <column_definition> | <computed_column_definition> | <column_set_definition> | [ <table_constraint> ] [ ,... n ] | [...
SELECT*FROMv$trxwaitWHEREid=上述语句得到结果的 TRX_ID 若查询不到结果,说明该语句没有发生事务性等待。如果发现语句活动,且没有事务性等待,则大概率是该语句自身执行存在效率问题,需要对执行计划进行调整。具体方式可以参考性能诊断与优化章节 sql 优化。
USE TestDB; GO -- Create a temporary table with the same column declarations -- as TestPermTab CREATE TABLE #TestTempTab (PrimaryKey int PRIMARY KEY, Col1 nchar ); INSERT INTO #TestTempTab SELECT * FROM TestPermTab; GO 承上例, tempdb 資料庫使用 Latin1_General_CS_AS 定...
(1)CREATE TABLE 创建一个指定名字的表。如果相同名字的表已经存在,则抛出异常;用户可以用 IF NOT EXISTS 选项来忽略这个异常。 (2)EXTERNAL关键字可以让用户创建一个外部表,在建表的同时指定一个指向实际数据的路径(LOCATION),Hive创建内部表时,会将数据移动到数据仓库指向的路径;若创建外部表,仅记录数据所在的路...
1INSERTOVERWRITETABLEtemp_b2SELECT3t1.seller_id4,t2.seller_level5FROM6(7SELECT8seller_id9,count(buyer_id)asbuy_num10FROMtable_a11GROUPBYseller_id12)t113LEFTJOIN14(15SELECT16seller_id17,seller_level18FROMtable_b19)t220ONt1.seller_id=t2.seller_id21ANDt1.buy_num>10000;22--获取最终结果23SE...