SQL(Structured Query Language)是一种用于管理关系型数据库的编程语言。它可以用于创建、修改和查询数据库中的数据和表结构。在查找第二高薪时,可以使用以下SQL命令: 代码语言:sql 复制 SELECT MAX(salary) AS second_highest_salary FROM employees WHERE salary < (SELECT MAX(salary) FROM employees); 上述SQL命...
For example, given the above Employee table, the query should return200as the second highest salary. If there is no second highest salary, then the query should returnnull +---+ | SecondHighestSalary | +---+ | 200 | +---+ Subscribeto see which companies asked this question. 翻译: 题...
For example, given the above Employee table, the query should return200as the second highest salary. If there is no second highest salary, then the query should returnnull +---+ | SecondHighestSalary | +---+ | 200 | +---+ Subscribeto see which companies asked this question. 翻译: 题...
Solution Approach: Using sub-query and LIMIT clause [Accepted] Sort the distinct salary in descend order and then utilize the LIMIT clause to get the second highest salary. SELECTDISTINCTSalaryASSecondHighestSalaryFROMEmployeeORDERBYSalaryDESCLIMIT1OFFSET1 However, this solution will be judged as ‘W...
select query_name, round(sum(rating / position) / count(*), 2) as quality, round(sum(rating < 3) / count(*) * 100, 2) as poor_query_percentage from queries group by query_name 一些细节,在查找只出现一次的数字的时候,当需要返回null的时候列表为空的情况(LC:691) ...
A phantom read is a situation that occurs when two identical queries are executed and the set of rows returned by the second query is different. The example below shows how this may occur. Assume the two transactions below are executing at the same time. The two SELECT statements in the fi...
You can start with the following, but may have to add simple scripts to query system tables:复制 SQLServer:Databases\Log File(s) Size (KB) SQLServer:Database\Log File(s) Used Size (KB) SQLServer:Database\Percent Log Used SQLServer:Database\Transactions/Sec ...
The SQL Server Database Engine processes queries on various data storage architectures such as local tables, partitioned tables, and tables distributed across multiple servers. The following sections cover how SQL Server processes queries and optimizes query reuse through execution plan caching....
When I ran the same query for the 10th highest score, my answer was 87. The ultimate answer to the question of rankings for 4th through 10th can either be inferred by inspection, or determined by running a query (see 4ththru10th.sql in theDownload file). ...
Run the Transact-SQL to ensure that your SQL Server database is set to the highest available compatibility level. Ensure that your database has its LEGACY_CARDINALITY_ESTIMATION configuration turned OFF. Clear your Query Store. In your database, ensure that Query Store is ON. Run the statement...