-- Assign the function result to the variable: SELECT @MyResult1 = SQRT(@MyNumber1), @MyResult2 = SQRT(@MyNumber2) -- Return the variable value SELECT @MyResult1, @MyResult2 上面的例子首先声明了4个变量,然后用两个SELECT语句给这些变量赋值,而不是用4个SELECT语句给变量赋值。虽然这些技...
SELECT PNR_no AS 'PNR NUMBER' FROM Reservation //搜索Reservation表的PNR_no列,显示列名为“PNR NUMBER” 23、使用标识列: SELECT IDENTITY(datatype,seed,increment) AS column_name INTO Table2 FROM Table1 //检索表Table1,将检索到的内容放到表Table2中列名为column_name的列中,datatype为数据类型(Int或...
<variable_name> <table_name>.<column_name>%TYPE; 其中<variable_name>是变量名称,<table_name>是用于锚定数据类型的表的名称,<column_name>是用于锚定数据类型的列的名称。 n_id AUTHORS.id%TYPE; v_name %TYPE; d_birth_date AUTHORS.birth_date%TYPE; v_gender AUTHORS.gender%TYPE; 1. 2. 3. ...
CREATE [ < owner > ] VIEW view_name [ ( column [ ,...n ] ) ] [with encryption] AS select_statement 如: create view emprange (emp_id, fname, lname, pubid, job_id, rows) with encryption as select emp_id, fname, lname, pub_id , job_id, @@rowcount from employee where job...
SQL>shutdownimmediate;Databaseclosed.Databasedismounted.ORACLEinstanceshutdown.SQL>startupORACLEinstancestarted.TotalSystemGlobalArea2432695144bytesFixedSize8899432bytesVariableSize536870912bytesDatabaseBuffers1879048192bytesRedoBuffers7876608bytesDatabasemounted.Databaseopened.SQL>showparameteraudit_trail;NAMETYPEVALUE--...
column_name%TYPE; 代码演示: DECLARE --定义变量sal,引用为emp表中sal列的类型 sal emp.sal%TYPE; mysal number(4):=3000; -- 定义变量totalsal,引用变量mysal的类型 totalsal mysal%TYPE; BEGIN SELECT SAL INTO sal FROM emp WHERE empno=7934; totalsal:=sal+mysal; dbms_output.put_line(total...
SELECT row_group_id, CAST(deleted_rows AS float)/CAST(total_rows AS float)*100 AS [% fragmented], created_time FROM sys.dm_db_column_store_row_group_physical_stats WHERE object_id = OBJECT_ID('FactOnlineSales2') AND state_desc = 'COMPRESSED'...
Updating columns by using a two-way assignment such asUPDATE T1 SET @v = column_name = <expression>can produce unexpected results because the live value of the variable can be used in other clauses such as theWHEREandONclause during statement execution instead of the ...
generated.column.name.multi.window 说明:使用自动生成的alias的问题。 旧版MaxCompute会为select语句中的每个表达式自动生成一个alias,这个alias会最后显示在Console上。但是,它并不承诺这个alias的生成规则,也不承诺这个alias的生成规则会保持不变,所以不建议用户使用自动生成的alias。 MaxCompute 2.0会对使用自动生成alias...
CREATE [ OR ALTER ] FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ] [ type_schema_name. ] parameter_data_type [ NULL ] [ = default ] [ READONLY ] } [ , ...n ] ] ) RETURNS @return_variable TABLE <table_type_definition> [ WITH <function_option> [ ,...