一、原题 Evaluate the following two queries: SQL> SELECT cust_last_name, cust_city FROM customers WHERE cust_credit_limit IN (1000, 2000, 3000); SQL> SELECT cust_last_name, cust_city FROM customers WHERE cust_credit_limit 1000 OR cust_credit_limit …
1.hasOwnProperty():
hasOwnProperty可以检测一个属性是存在于实例中,还是原型中。返回布尔值,只有当属性存在于实例中的时候才会返回true。
function Person(){}Person.prototype.name hello;var p new Person();console.log(p.hasOwnProperty(name…
一、原题 View the Exhibit and examine the structure of the PROMOTIONS table. You have to generate a report that displays the promo name and start date for all promos that started after the last promo in the INTERNET category. Which query would give you …
一、原题 Which statement is true regarding subqueries? A. The LIKE operator cannot be used with single- row subqueries. B. The NOT IN operator is equivalent to IS NULL with single- row subqueries. C. ANY and ALL operators have the same functionality in m…
mysql 中 find_in_set() 方法:
让我们先列举一个示例:
1. 测试代码:
2. CREATE TABLE test (
3. id int(8) NOT NULL auto_increment,
4. name varchar(255) NOT NULL,
5. list varchar(255) NOT NULL,
6. PRIMARY KEY (…
Its so easy to fall in love. 顺歌单的时候听到六十秒的KG音乐,刚好是这句歌词。这是一个很多流行歌曲原外文曲的歌单,熟悉的旋律响起的时候,一瞬间脑子闪过挺多想法,想到歌曲翻唱和软件开发有某种异曲同工之妙,大三的…
1.between语句: mysql> select * from 4a where score between 76 and 89; +--------+------+--------+------+--------+------+------+-------+ | sname | sage | tname | t | cname | s | c | score | +--------+------+--------+------+--------+------+---…
一、原题 Evaluate the following SQL statement: SQL>SELECT cust_id, cust_last_name FROM customers WHERE cust_credit_limit IN (SELECT cust_credit_limit FROM customers WHERE cust_city Singapore); Which sta…