I'm looking for a way of inserting a range of values into multiple rows. I have two columns that I am inserting into - project (stays the same) and sceneno, which is where the values will increment from x-y. Basically I am trying to convert the very inefficient PHP code below into...
rows in set (0.00 sec) mysql> insert into t13 (name,age,gender) values (NULL,'18','男'); ERROR 1048 (23000): Column 'name' cannot be null mysql> insert into t13 (age,gender) values ('18','男');//如果我们没有明确指定一列要插入,用的是default,如果建表中对应列默认没有设置...
WHERE p.category = 'Electronics'; 2.4 INSERT ON DUPLICATE KEY UPDATE 独特价值: 实现”更新或插入”逻辑 避免先查询后更新的两次操作 INSERT INTO user_scores (user_id, score, last_update) VALUES (101, 1500, NOW()), (102, 3200, NOW()), (103, 2750, NOW()) ON DUPLICATE KEY UPDATE scor...
-- 单条插入 INSERT INTO products (name, price) VALUES ('键盘', 199.00); -- 批量插入 INSERT INTO products (name, price) VALUES ('鼠标', 99.00), ('显示器', 1299.00); 4.2 数据查询 -- 基础查询 SELECT * FROM products WHERE price > 100; -- 排序与分页 SELECT id, name FROM products ...
Inserting Multiple Rows (3:18) 小结 VALUES ……里一行内数据用括号内逗号隔开,而多行数据用括号间逗号隔开 案例 插入多条运货商信息 USE sql_store INSERT INTO shippers (name) VALUES ('shipper1'), ('shipper2'), ('shipper3'); 1. 2. ...
insert into innodb1 (first_name,last_name,id_card,information) values ('张','三','1001','华山派'); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 我们可以通过explain selelct来分析SQL语句执行前的执行计划: 由上图可看出此SQL语句是按照主键索引来检索的。
mysql> insert into t1 values('你瞅啥 ','你瞅啥 '); Query OK, 1 row affected (0.05 sec) mysql> SET sql_mode=''; Query OK, 0 rows affected, 1 warning (0.00 sec) #在检索时char很不要脸地将自己浪费的2个字符给删掉了,装的好像自己没浪费过空间一样,而varchar很老实,存了多少,就显示多...
with values of 4 and 7. Separate transactions that attempt to insert values of 5 and 6, respectively, each lock the gap between 4 and 7 with insert intention locks prior to obtaining the exclusive lock on the inserted row, but do not block each other because the rows are nonconflicting....
DML(Data Manipulation Language):数据操作语言,用于添加、删除、更新和查询数据库记录,并检查数据完整性,常用的关键字主要包括insert、delete、update和select等 插入记录 insert into emp(ename,sal,deptno) values('zhangsan','2015-08-01','2000',1); insert into emp(ename,sal,deptno) values('lisi','2015...
if (($stmt->affected_rows > 0) && isset($_POST['size'])) { // get the product's primary key $product_id = $stmt->insert_id; foreach ($_POST['size'] as $size_id) { if (is_numeric($size_id)) { $values[] = "($product_id, " . (int) $size_id . ')'; ...