创建函数公式（iq INT，sq INT，IG INT）返回INT 开始 宣布结果INT;SET结果=（iq-（（sq/30）））...
CREATEFUNCTIONFortyTwo()RETURNSTINYINTDETERMINISTICBEGINDECLARExTINYINT;SETx=42;RETURNx;END; Attempting to run will result in an error: CREATEFUNCTIONFortyTwo()RETURNSTINYINTDETERMINISTIC->BEGIN->DECLARExTINYINT;ERROR1064(42000):YouhaveanerrorinyourSQLsyntax;checkthemanualthatcorrespondstoyourMariaDBserver...
-- dbname 数据库名;tablename:表名;accdate:日期 DECLARE num INT; SET @if_sql = CONCAT("SELECT count(*) INTO @record FROM information_schema.partitions where table_schema='",dbname,"' and table_name='",tablename,"' AND PARTITION_NAME='p",accdate,"'"); SET @alter_sql = CONCAT("A...
使用DECLARE语句定义异常变量,并使用HANDLER语句来处理异常情况。 如何优化存储过程查询性能?为了提高存储过程查询的性能,可以考虑以下几点: 使用合适的索引来加速查询。 避免在循环中执行查询,尽量使用集合操作。 使用临时表来存储中间结果,以减少查询的复杂性。 定期优化和分析存储过程,以确保其性能最佳。 对于Maria...
An error that is handled by aDECLARE HANDLERconstruct can be issued again using theRESIGNALstatement. Below is an example usingDECLARE HANDLER: CREATETABLEtest.t(s1INT,PRIMARYKEY(s1));DELIMITER//CREATEPROCEDUREhandlerdemo()BEGINDECLARECONTINUEHANDLERFORSQLSTATE'23000'SET@x2=1;SET@x=1;INSERTINTOtes...
( userID BIGINT, # 注意,当存储过程参数如果用于存储过程中,表查询语句的WHERE子句...DECLARE total_price1 DECIMAL(9, 4); # 用于存储交易总金额 DECLARE share_price1 DECIMAL(9, 4); # 用于存储消费返利金额...INTO variable1, ...; 如果column1和variable1名称不可以相同,否则取不到值,variable1...
DECLARE num INT; SET @if_sql = CONCAT("SELECT count(*) INTO @record FROM information_schema.partitions where table_schema='",dbname,"' and table_name='",tablename,"' AND PARTITION_NAME='p",accdate,"'"); SET @alter_sql = CONCAT("ALTER TABLE ",tablename," ADD PARTITION (PARTITION...
DECLARE语法不一样,Oracle DECLARE在BEGIN之前,MySQL则在BEGIN里面 MySQL不支持FOR... IN... LOOP的语法,这里改用WHILE来实现;MySQL也不支持"1..10"这种写法 数据类型不同,Oracle中是NUMBER,MySQL是INT 变量赋值不同,Oracle使用了“:=”,MySQL是 “SET .. = ...” ...
declare get_email varchar(20); set @aid1 := 'ass333'; set @t_name := (select table_name from aid_ref where aid=@aid1); set @get_email= CONCAT("SELECT email FROM ",@t_Name,"where aid=",@aid1); Prepare stmt FROM @get_email; ...
Syntax The syntax to set up a handler for the NOT FOUND condition for a cursor in MariaDB is: DECLARE CONTINUE HANDLER FOR NOT FOUND [ set_condition ]; Parameters or Arguments set_condition The condition to set when the NOT FOUND condition is encountered by the cursor. ...