delimiter // CREATE PROCEDURE area_pro2 ( IN x INT, OUT alarm_count INT, OUT over_spped INT, OUT over_spped_10 INT, OUT over_spped_20 INT, OUT over_spped_50 INT, OUT untreated INT, OUT processed INT ) BEGIN WITH cte AS ( SELECT organization_id FROM `user` WHERE organization_id = x OR father LIKE CONCAT( COALESCE ( ( SELECT father FROM `user` WHERE organization_id = x ), "" ), x, "-%" ) AND is_del = 0 ) SELECT count( location_alarm.id ) INTO alarm_count, COUNT( CASE WHEN location_alarm.max_speed > location_alarm.speed_limit * 10 THEN 0 END ), count( CASE WHEN location_alarm.max_speed / location_alarm.speed_limit > 11 THEN 0 END ) INTO over_spped_10, count( CASE WHEN location_alarm.max_speed / location_alarm.speed_limit > 12 THEN 0 END ) INTO over_spped_20, count( CASE WHEN location_alarm.max_speed / location_alarm.speed_limit > 15 THEN 0 END ) INTO over_spped_50, count( CASE WHEN location_alarm.alarm_process_id IS NULL THEN 0 END ) INTO untreated, count( location_alarm.alarm_process_id ) INTO processed FROM cte INNER JOIN car ON car.organization_id = cte.organization_id AND car.is_del = 0 INNER JOIN location_alarm ON car.id = location_alarm.car_id; END // 我这个存储过程为什么报错了

knn.rar_in_knn python实现_k近邻_python 算法_近邻分类

X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42) 创建并训练KNN模型： python # 创建KNN分类器 knn = KNeighborsClassifier(n_neighbors=3) # 训练模型 knn....

在MySQL中创建带有IN和OUT参数的存储过程的方法

CREATE PROCEDURE usp_GetEmployeeName(IN id INT, OUT name VARCHAR(20)) BEGIN SELECT emp_name INTO name FROM employee WHERE emp_id = id; END // DELIMITER ; 在这个过程中，SELECT...INTO语句将查询...

解释一下数据库代码什么意思delimiter // ysg1>create procedure p_student ( begin ->select from student;end/luery 0K,0 rows affected (0.01 sec) wysql> cal1 p student0//RROR 1064 (42000): You have an error in your SQL syntax; check thwysql>delimiter//wysql>create procedure p_student(0)begin->select from student.->end/!RROR 1304 (42000): PROCEDURE p_student already existswysql> delimiter //uysql> create procedure p_student -> beginselect* from student;end/!

create procedure p_student ( begin ->select *from student;end/ 中的括号后面没有加上 ) 符号，而且在 end/ 后面多了一个冒号。另外，查询语句的后面缺少了分号。第二个例子中，正确使用了 delimiter ...

说明这段代码是干什么的create database 学生选课; use 学生选课; source C:\Users\Administrator\Desktop\xuexi.sql show tables; select * from student; set @c1=1,@c2=2,@c3=3; select @c1,@c2,@c3; delimiter // create function fn1() returns datetime reads sql data begin return now(); end// select fn1() as 当前时间// select now()// delimiter // create function fn2(a int,b int) returns int reads sql data begin return a+b; end// select fn2(321,123)// select fn2(9876,3546)// show create function fn1\G drop function fn1// create procedure proc1() begin declare a int default 100; set a=a+50; select a; end// call proc1()// delimiter // create procedure aaa() begin declare v varchar(5); set v='你好'; if v is null then select '是空值'; else select '不是空值'; end if; end// call aaa()// delimiter // create procedure bbb() begin declare v int; set v=100; case v when 1 then select'值是1'; when 2 then select'值是2'; else select '值不是1也不是2'; end case; end // call bbb()// delimiter // create procedure xunhuan() begin declare pl int default 0; my_loop:loop set pl=pl+1; select '你真好看'; if pl>10 then leave my_loop; end if; end loop my_loop; end// call xunhuan()// delimiter // create procedure p_student () begin select from student; end// call p_student()// desc student// delimiter // create procedure p_student2(dept varchar(8)) begin select from student where sdept=dept; end// call p_student2('云计算技术')// call p_student2('人工智能系')// call p_student2('大数据技术')// delimiter // create procedure p_student3(sex char(2), out renshu int) begin if sex='男' then select count(ssex) into renshu from student where ssex='男'; else select count(ssex) into renshu from student where ssex='女'; end if; end// call p_student3('男', @renshu)// select @renshu // call p_student3('女', @renshu)// select @renshu// show create procedure p student2\G drop procedure p student2// create database 网上书店数据库; use 网上书店数据库; source C:\Users\Administrator\Desktop\online bookstore.sql show tables; select * from user; delimiter // create procedure proc_1() begin select * from user; end// call proc_1()// delimiter // create procedure proc_2(昵称 varchar(20),out 积分 int) begin select score into 积分 from user where uname=昵称; end// call proc_2( 平平人生,@积分)// select @积分// call proc_2(感动心灵’,@积分)// select @积分//

接下来创建两个函数fn1和fn2，并进行测试调用。然后创建四个存储过程proc1、aaa、bbb和xunhuan，并分别进行测试调用。最后在新创建的名为"网上书店数据库"的数据库中创建两个存储过程proc_1和proc_2，并进行测试调用...

delimiter // mysql> create procedure proc_stu_test() -> begin -> select count(*) from student -> end //

CREATE PROCEDURE procedure_name([IN parameter_name data_type[, ...]]) BEGIN -- 存储过程的操作 END; 其中，procedure_name 是存储过程的名称，parameter_name 是输入参数的名称，data_type 是输入...

delimiter // create procedure count_1(in s_sname varchar(30),out count_sname char) begin select count(sname) as 总人数 into count_sname from student where sname=s_sname; End// delimiter; call count_1(@count_sname); select @count_sname as 总人数; MySQL错在哪里

create procedure count_1(in s_sname varchar(30),out count_sname char) begin select count(sname) as 总人数 into count_sname from student where sname=s_sname; End// delimiter; call count_1('张三'...

DELIMITER // CREATE PROCEDURE reader_credit(IN reader_id INT) BEGIN SELECT Reader_id, credit_rank FROM Reader JOIN Credit ON Reader.Credit_id = Credit.Credit_id and Reader_id=reader_id; END //

CREATE PROCEDURE reader_credit(IN reader_id INT) BEGIN SELECT Reader_id, credit_rank FROM Reader JOIN Credit ON Reader.Credit_id = Credit.Credit_id and Reader_id=reader_id; END // 请注意，我...

2.创建一个存储过程，实现计算学生刘宏的所有课程的总分。 -- 命令： delimiter // create procedure sum_1(in s_sno varchar(40),out sum_score double) begin select sum(score) as 总分 into sum_score from student,sc where student.sno=sc.sno and sno=s_sno group by sc.sno; End// delimiter ; call sum_1('1604201',@sum_score); select @sum_score as 总分;

create procedure sum_1(in s_sno varchar(40),out sum_score double) begin select sum(score) as 总分 into sum_score from student,sc where student.sno=sc.sno and sno=s_sno group by sc.sno; End// ...

DELIMITER // CREATE PROCEDURE import_data_from_file() BEGIN LOAD DATA INFILE '/path/to/data.csv' INTO TABLE your_table_name FIELDS TERMINATED BY ',' -- 指定字段分隔符 ENCLOSED BY '"' -- 指定字段引用符 LINES TERMINATED BY '\n' -- 指定行分隔符 IGNORE 1 ROWS; -- 忽略第一行（标题行） END // DELIMITER ;

非常好！你的代码是一个更简单和更有效的解决...请注意，这种方法要求 MySQL 服务器和客户端都已经正确地配置了 local_infile 参数，以允许从本地文件系统中加载数据。如果你遇到了任何问题，请确保检查这个设置。

delimiter // create function wzq_11() returns int deterministic begin declare rs int; select count(*) into rs from student; IF rs=0 THEN return '此表人数为空'; ELSE return rs; END IF; end // delimiter ; select wzq_11() as 学生人数 ;为这个代码每行都写上注释

create function wzq_11() returns int deterministic begin declare rs int; -- 声明一个整型变量 rs select count(*) into rs from student; -- 查询 student 表的总行数并存放在 rs 中 IF rs=0 THEN -- 如果...

用pgSQL改写这段代码，使用游标获取指定 empno 的员工的每条工资记录中的工资数额。使用 LOOP 语句编写循环。DELIMITER // CREATE PROCEDURE calc_avg_and_var_salary_for_emp_no(IN emp_no_in INT, OUT AVG REAL, OUT var REAL) BEGIN DECLARE done INT DEFAULT 1; DECLARE sal REAL; DECLARE num INT; DECLARE cur1 CURSOR FOR SELECT salary FROM salaries WHERE emp_no = emp_no_in; DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 0; SET var = 0, AVG = 0, num = 0; OPEN cur1; FETCH cur1 INTO sal; WHILE done = 1 DO SET AVG = AVG + sal; SET var = var + salsal; SET num = num + 1; FETCH cur1 INTO sal; END WHILE; CLOSE cur1; SET AVG = AVG/num; SET var = var/num - AVGAVG; END// DELIMITER ;

CREATE OR REPLACE FUNCTION calc_avg_and_var_salary_for_emp_no(IN emp_no_in INT, OUT AVG REAL, OUT var REAL) AS $$ DECLARE done INT DEFAULT 1; sal REAL; num INT; cur1 CURSOR FOR SELECT salary ...

delimiter // create PROCEDURE usp_randCardID() BEGIN @cardid=concat('10103576',right(rand(),8)); END //

- create PROCEDURE usp_randCardID() 语句用于创建一个名为 usp_randCardID 的存储过程。 - BEGIN 语句用于标记存储过程的开始。 - @cardid=concat('10103576',right(rand(),8)); 语句用于生成随机的银行卡号...

delimiter // create function func_user(in in_id int) returns varchar(50) begin declare out_name varchar(50); select name into out_name from tb_user where id = in_id; return out_name; end//

create function func_user(in in_id int) returns varchar(50) begin declare out_name varchar(50); select name into out_name from tb_user where id = in_id; return out_name; end // delimiter ; 在...

delimiter // create procedure proc_local() begin declare x char(10) default '外层'; begin declare x char(10) default '内层'; select x; end; select x; end; //

这个存储过程的作用是在过程内声明了两个局部变量 x，一个是外层的 x，一个是内层的 x，在内层代码块中，局部变量 x 覆盖了外层的 x。当执行查询语句时，返回的是内层 x 的值。最终，执行查询语句后，也会返回外层 x...

用pgSQL改写这段代码DELIMITER // CREATE FUNCTION is_manager(emp_no_in INT) RETURNS BOOL BEGIN SET @dept = (SELECT COUNT(*) FROM dept_manager WHERE emp_no = emp_no_in); IF @dept = 0 THEN RETURN 0; ELSE RETURN 1; END IF; END// DELIMITER ;

CREATE OR REPLACE FUNCTION is_manager(emp_no_in INT) RETURNS BOOL AS $$ DECLARE dept_count INT; BEGIN SELECT COUNT(*) INTO dept_count FROM dept_manager WHERE emp_no = emp_no_in; IF dept_count = 0 ...

delimiter // create function count_fun() /创建计数函数/ returns char(10) deterministic begin declare sumc char(20); select count() into sumc from bookinfo where Price >= 40; /返回图书价格不小于40的总数/ return sumc; end // delimiter ; select count_fun(); delimiter // /通过输入的图书编号来计算剩余书本的总价/ create function total_fun(Bid char(10)) returns decimal(10,2) deterministic begin declare pri decimal(10,2); declare qy char(20); declare totals decimal(10,2); select price into pri from bookinfo where bookid = Bid; select quantity into qy from booktype where bookid = Bid; set totals = pri qy; return totals; end // delimiter ; select total_fun('000001');

具体来说，代码先声明了一个变量sumc，然后使用select count(*) into sumc from bookinfo where Price >= 40;查询满足条件的记录数，并将结果存储到sumc中，最后将sumc作为函数的返回值。对于您的第二个问题，代码...

DELIMITER // CREATE PROCEDURE get_total_row_count() BEGIN DECLARE done INT DEFAULT FALSE; DECLARE schema_name VARCHAR(255); DECLARE table_name VARCHAR(255); DECLARE total_rows INT DEFAULT 0; DECLARE row_count INT; DECLARE cur CURSOR FOR SELECT table_schema, table_name FROM information_schema.tables WHERE table_type = 'BASE TABLE' AND table_schema like 'tes%'; -- 这里改成yqq应该就可以了 DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE; OPEN cur; read_loop: LOOP FETCH cur INTO schema_name, table_name; IF done THEN LEAVE read_loop; END IF; SET @sql = CONCAT('SELECT COUNT(*) INTO @row_count FROM ', schema_name, '.', table_name); PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt; SET total_rows = total_rows + @row_count; END LOOP; CLOSE cur; SELECT total_rows; END // DELIMITER ;

这是一个MySQL存储过程，用于获取指定数据库中所有表的总行数。它使用游标循环遍历满足条件的表，并使用动态SQL语句计算每个表的行数，然后累加...CALL get_total_row_count(); 执行后，存储过程将返回总行数。

DELIMITER // CREATE PROCEDURE insert_borrow_orders() BEGIN DECLARE i INT DEFAULT 2017; WHILE i <= 2019 DO SET @table_name = CONCAT('borrow_order_', i); SET @query = CONCAT('INSERT INTO ', @table_name, ' (id, order_no, borrow_id, glc, libcode, rdid, create_time, should_revert_time, revert_time, status) SELECT id, order_no, borrow_id, glc, libcode, rdid, create_time, should_revert_time, revert_time, status FROM borrow_order WHERE SUBSTR(borrow_id, 1, 1) REGEXP ''[^0-9.]'' = 1 AND SUBSTR(borrow_id, 2, 4) = ''', i, ''' OR SUBSTR(borrow_id, 1, 4) = ''', i, ''';'); PREPARE statement FROM @query; EXECUTE statement; SET i = i + 1; END WHILE; END // DELIMITER ; 怎么执行这个存储过程

可以使用 MySQL 客户端连接到对应的数据库，然后执行以下命令： CALL insert_borrow_orders(); 这将会调用 insert_borrow_orders 存储过程，并执行其中的 SQL 语句。请确保在执行存储过程之前已经创建好...

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knn.rar_in_knn python实现_k近邻_python 算法_近邻分类

在MySQL中创建带有IN和OUT参数的存储过程的方法

delimiter // mysql> create procedure proc_stu_test() -> begin -> select count(*) from student -> end //

delimiter // create procedure count_1(in s_sname varchar(30),out count_sname char) begin select count(sname) as 总人数 into count_sname from student where sname=s_sname; End// delimiter; call count_1(@count_sname); select @count_sname as 总人数; MySQL错在哪里

DELIMITER // CREATE PROCEDURE reader_credit(IN reader_id INT) BEGIN SELECT Reader_id, credit_rank FROM Reader JOIN Credit ON Reader.Credit_id = Credit.Credit_id and Reader_id=reader_id; END //

delimiter // create function wzq_11() returns int deterministic begin declare rs int; select count(*) into rs from student; IF rs=0 THEN return '此表人数为空'; ELSE return rs; END IF; end // delimiter ; select wzq_11() as 学生人数 ;为这个代码每行都写上注释

delimiter // create PROCEDURE usp_randCardID() BEGIN @cardid=concat('10103576',right(rand(),8)); END //

delimiter // create function func_user(in in_id int) returns varchar(50) begin declare out_name varchar(50); select name into out_name from tb_user where id = in_id; return out_name; end//

delimiter // create procedure proc_local() begin declare x char(10) default '外层'; begin declare x char(10) default '内层'; select x; end; select x; end; //

用pgSQL改写这段代码DELIMITER // CREATE FUNCTION is_manager(emp_no_in INT) RETURNS BOOL BEGIN SET @dept = (SELECT COUNT(*) FROM dept_manager WHERE emp_no = emp_no_in); IF @dept = 0 THEN RETURN 0; ELSE RETURN 1; END IF; END// DELIMITER ;

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