CASE 陳述式有兩種類型: 簡式case 陳述式: 用來根據文字值輸入部分邏輯 搜尋的 case 陳述式: 用來根據表示式的值輸入部分邏輯 CASE 陳述式的 WHEN 子句定義當滿足時決定控制流程的值。 以下是具有含簡式 case-statement-when-clause 之 CASE 陳述式的 SQL 程序範例: CREATE PROCEDURE UPDATE_D
The searched CASE statement evaluates multiple Boolean expressions and executes the sequence of statements associated with the first condition that evaluates to TRUE. The searched CASE statement has the following structure: CASE WHEN condition_1 THEN statements_1 WHEN condition_2 THEN statements_2 ......
TheCASE expressionis used to build IF … THEN … ELSE statements into your Microsoft SQL Server T-SQL code. CASE is used within a SQL statement, such as SELECT or UPDATE. Don’t mistake CASE for theIF ELSEcontrol of flow construct, which is used to evaluate the conditional execution of ...
Changing multiple values: If there is a change in prices or stock levels, then the UPDATE Statement can be used on multiple statements to update. Handling Inactive Records: The status of the account or subscriptions can be updated if it expires. Data Cleaning: The UPDATE Statement can be used...
In this case, the documents that contain Bluetooth are assigned high ranks. Advanced queries Specify multiple search queries based on the same index Syntax: query=Index name:'Search query'^boost | 'Search query'^boost query=Index name:'Search query'^boost & 'Search query'^boost The vertical...
SQL CASE Statement - Learn how to use the SQL CASE statement to perform conditional logic in your SQL queries effectively.
Different Formats of CASE Statements A simple CASE statement expression In this format, we evaluate one expression against multiple values. In a simple case statement, it evaluates conditions one by one. Once the condition and expression are matched, it returns the expression mentioned in THEN cla...
In the next statements showing index creation and subsequent query, Oracle will use indexincome_ixeven though the columns are in reverse order in the query: CREATE INDEX income_ixON employees(salary + (salary*commission_pct));SELECT first_name||' '||last_name "Name"FROM employeesWHERE (salary...
报错:Update row with Key (id)=(xxxx) multiple times或者duplicate key value violates unique constraint 问题原因:违反唯一性约束,执行UPDATE、INSERT ON CONFLICT或INSERT操作时,主键存在重复数据。 解决方法: 若INSERT语法报错:可以改为INSERT INTO xx ON CONFLICT的语法,实现主键去重,详情请参见INSERT ON CONFLIC...
function to return multiple values in SQL SERVER Function with CASE Statements Functions not recognized in sql server 2012 Fuzzy String Matching Geeting TIMEOUT while executing a Stored Procedure. Generate a alphanumeric id for primary key min 4 digits Generate all the quarters between start and end...