SQL 标准支持以返回表作为结果的函数;这种函数称为表函数( table function )。请考虑下图中定义的函数。该函数返回一个包含特定系的所有教师的表。请注意,当引用函数的参数时需要给它加上函数名作为前缀( instructor_of.dept_name )。 此函数可以按如下方式在查询中使用: select * from table(instructor_of('Fina...
以下是创建一个简单函数的基本语法: DELIMITER//CREATEFUNCTIONmy_function()RETURNSTABLEBEGIN-- 返回的结果集内容END;//DELIMITER; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 然而需要注意的是,在MySQL中,标准的函数不能直接返回表。相反,我们可以使用存储过程或视图来达到类似的效果。 使用存储过程返回表 比起...
Sql server 的表值函数是返回一个Table类型,table类型相当与一张存储在内存中的一张虚拟表。 createfunctiontvpoints()returns@pointstable(xfloat, yfloat)asbegininsert@pointsvalues(1,2);insert@pointsvalues(3,4);return;endselect*fromtvpoints()--像查询表一样运行--运行结果x y1234 如何?其实作用就是KES...
RETURN(SELECT * FROM my_table); END $$ delimiter ; CREATE VIEW my_view AS SELECT my_function (10); SELECT * FROM my_view; Sadly, it fails at the beginning. I got the following error : ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that ...
CREATE OR REPLACE FUNCTION test_return_ret () RETURNS TABLE (YEARly VARCHAR, MONTH VARCHAR) AS $$ SELECT YEARly, MONTH FROM dev_bi_monthly $$ LANGUAGE SQL; --对于已经确定的表结构 CREATE OR REPLACE FUNCTION test_return_ret2 () RETURNS SETOF dev_bi_monthly ...
The RETURN statement returns from a routine. For SQL scalar functions, it returns the result of the function. For SQL non-pipelined table functions, it returns a table as the result of the function. For SQL pipelined table functions, it indicates the end
First, create the procedure that declares and then opens a cursor on theCurrencytable. SQL USEAdventureWorks2022; GO IF OBJECT_ID('dbo.uspCurrencyCursor', 'P') IS NOT NULLDROPPROCEDUREdbo.uspCurrencyCursor; GOCREATEPROCEDUREdbo.uspCurrencyCursor @CurrencyCursorCURSORVARYINGOUTPUTASSETNOCOUNT...
Table Table Joins Trigger User Previliege View XMLReturn value from a function : Function Return « Stored Procedure Function « Oracle PL / SQLOracle PL / SQL Stored Procedure Function Function Return Return value from a function SQL> -- The mypi function. SQL> CREATE OR REPLACE FUNCTIO...
CreateExternalTableStatement CreateFederationStatement CreateFullTextCatalogStatement CreateFullTextIndexStatement CreateFullTextStopListStatement CreateFunctionStatement CreateIndexStatement CreateLoginSource CreateLoginStatement CreateMasterKeyStatement CreateMessageTypeStatement CreateOrAlterFunctionStatement ...
DROPTABLEfoo cascade;CREATETABLEfoo(fooidINT,foosubidINT,foonameTEXT);INSERTINTOfooVALUES(1,2,'three');INSERTINTOfooVALUES(4,5,'six');CREATEORREPLACEFUNCTIONf4()RETURNSSETOFrecordAS$BODY$DECLAREr foo%rowtype;BEGINFORrINSELECT*FROMfooWHEREfooid>0LOOPRETURNNEXTr;ENDLOOP;RETURN;END;$BODY$LANGUAGE...