We can declare multiple local variables and use them in SQL by declaring each of them individually using DECLARE statement for each of them or using a single DECLARE statement and declaring all the variables in the same statement by separating the declaration of each variable with a comma. ADVER...
EXECSQLINSERTINTO(col_list)VALUES(expr|:host_variable) INSERT语句的语法遵循 OceanBase Oracle 模式中INSERT语句的语法规则。 示例语句如下所示: intc1val=0;char*c2val="demo";EXECSQLCREATETABLEt1(c1int,c2 varchar2(100));EXECSQLINSERTINTOt1VALUES(:c1val,:c2val);EXECSQLINSERTINTOt1(c1)VALUES(:c1...
VALUES DUMP OPTION VARYING ELSE OR VIEW END ORDER WAITFOR ERRLVL OUTER WHEN ESCAPE OVER WHERE EXCEPT PERCENT WHILE EXEC PIVOT WITH EXECUTE PLAN WRITETEXT 此外,ISO 标准定义了保留关键字列表。不要使用 ISO 保留关键字作为对象名和标识符。ODBC 保留关键字列表(如下表所示)与 ISO 保留关键字列表相同。
-- Create a variable with a default>DECLAREVARIABLEmyvarINTDEFAULT5; >VALUES(myvar); 5-- Setting a variable>SETVARmyvar = (SELECTsum(c1)FROMVALUES(1), (2)AST(c1); >VALUES(myvar); 3-- Variables are the outermost scope.>SELECTmyvar, t.myvar, session.myvarFROMVALUES(1)AST(myvar); 1 ...
DECLARE @myVariable AS VARCHAR = 'abc'; DECLARE @myNextVariable AS CHAR = 'abc'; --The following query returns 1 SELECT DATALENGTH(@myVariable), DATALENGTH(@myNextVariable); GO B. 顯示搭配 CAST 和 CONVERT 使用 varchar 時,n 的預設值 下列範例顯示搭配使用 char 或varchar 資料類型與 和CAST...
用declare声明的变量作用在block中。 variable是sqlplus中定义变量的命令。他定义的变量在一个sqlplus连接中有效。 SQL> show user USER 为"YANGTK" SQL> var SP2-0568: 未说明结合变量。 SQL> var test number SQL> var 变量test 数据类型 NUMBER
('hello', '1', 2); he -- Downcasting of a BIGINT to an INT > SELECT substring('hello', 1L, 2); he -- Crosscasting from STRING to INTEGER > SELECT substring('hello', str, 2) FROM VALUES(CAST('1' AS STRING)) AS T(str); he -- Crosscasting from INTEGER to STRING > ...
变量是类型化对象和架构限定对象,这些对象存储对会话私有的值。 在 Azure Databricks 变量中,是临时的,使用DECLARE VARIABLE语句在会话中声明。 临时变量和会话变量的术语是可互换的。 临时变量所在的模式是system.session。 变量在定义变量的会话结束时隐式删除。 不过,你也可以更早地使用DROP VARIABLE语句来显式删除...
VALUES ('Tannery Falls',web_page); END; --读写 DECLARE web_page BFILE; html RAW(60); amount BINARY_INTEGER := 60; offset INTEGER := 1; BEGIN --Retrieve the LOB locat0r for the web page SELECT falls_web_page INTO web_page
values of the parameter, also known as a parameter sensitive plan.Parameterized queries can have multiple cached query plans for different selectivity categories of a parameter. Parameter sensitive plan optimization is enabled by default in compatibility level 160. For more information, seePSP ...