Sql when then case
Web19 Sep 2024 · Not: MySQL, SQL Server, PostgreSQL. The next method we’ll look at is using a subquery to identify and delete duplicate data. I’ll show you the query first, then explain how it works. DELETE FROM tablename a WHERE a.rowid > ANY ( SELECT b.rowid FROM tablename b WHERE a.column1 = b.column1 ); Web当你需要在 sql 查询中进行条件映射时,可以使用 case when then 语句。 以下是一个简单的例子: 假设你有一个包含学生成绩的表格,你想根据学生成绩的不同区间来标记学生的等级(优秀、良好、及格、不及格),可以使用 case when then 语句实现。. 例如,假设以下是学 …
Sql when then case
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Web4 Mar 2024 · To do this with CASE you could write: SELECT FirstName, LastName, PersonType FROM Person.Person WHERE 1 = CASE WHEN PersonType = 'VC' THEN 1 WHEN PersonType = 'IN' THEN 1 ELSE 0 END The idea here is to test PersonType for either VC or IN. If it matches the corresponding CASE WHEN return a 1. The filter matches and the row … Web28 Feb 2024 · This loop continues doubling the prices until the maximum price is greater than $500, and then exits the WHILE loop. SQL. -- Uses AdventureWorks WHILE ( SELECT AVG(ListPrice) FROM dbo.DimProduct) < $300 BEGIN UPDATE dbo.DimProduct SET ListPrice = ListPrice * 2; SELECT MAX ( ListPrice) FROM dbo.DimProduct IF ( SELECT …
Web27 Jul 2010 · As soon as a WHEN statement is true the break is implicit. You will have to concider which WHEN Expression is the most likely to happen. If you put that WHEN at the … Web19 Apr 2024 · A case statement is basically SQL's version of conditional logic. It can be used in the same way as if statements in programming languages like JavaScript, but it is …
WebSQL Statement: x. SELECT OrderID, Quantity, CASE WHEN Quantity > 30 THEN 'The quantity is greater than 30'. WHEN Quantity = 30 THEN 'The quantity is 30'. ELSE 'The quantity is under 30'. END AS QuantityText. FROM OrderDetails; Edit the SQL Statement, and click "Run SQL" to see the result. WebOnce a WHEN clause is matched and its statements are executed, the CASE statement ends. The CASE statement is appropriate when there is some different action to be taken for each alternative. If you just need to choose among several values to assign to a variable, you can code an assignment statement using a CASE expression instead.
Web31 May 2024 · CREATE DATABASE [239583]; GO USE [239583]; GO SELECT TOP 10000000 CASE WHEN v.number % 2 = 0 THEN CAST (1 AS bit) ELSE CAST (0 AS bit) END AS a, CASE WHEN v.number % 2 = 1 THEN CAST (1 AS bit) ELSE CAST (0 AS bit) END AS b INTO dbo.TableName FROM master.dbo.spt_values v CROSS JOIN master.dbo.spt_values v2 …
Web20 Apr 2024 · This SQL Tutorial will teach you when and how you can use CASE in T-SQL statements. Solution The CASE expression is 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. image manufacturing connersville inWebThe SQL CASE Expression The CASE expression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition … Different Types of SQL JOINs. Here are the different types of the JOINs in SQL: … Edit the SQL Statement, and click "Run SQL" to see the result. Run SQL » Result: Click … In SQL, a view is a virtual table based on the result-set of an SQL statement. A view … The SQL INSERT INTO SELECT Statement. The INSERT INTO SELECT statement … SQL Operators - SQL CASE Expression - W3Schools Functions - SQL CASE Expression - W3Schools SQL UNIQUE Constraint. The UNIQUE constraint ensures that all values in a … SQL HAVING Clause - SQL CASE Expression - W3Schools image manchot plage pix motWeb7 Sep 2015 · CASE A WHEN 'ok' THEN C = 'ok' WHEN 'bad' THEN C = 'bad' An expression is something that can be evaluated on the right hand side of an assignment, or in a SELECT … image manufacturing group atlantaWebSELECT CASE WHEN manu_code = "HRO" THEN "Hero" WHEN manu_code = "SHM" THEN "Shimara" WHEN manu_code = "PRC" THEN "ProCycle" WHEN manu_code = "ANZ" THEN "Anza" ELSE NULL END FROM stock; You must include at least one WHEN clause within the CASE expression; subsequent WHEN clauses and the ELSE clause are optional. image manipulation artistsWebThe CASE statement goes through conditions and return a value when the first condition is met (like an IF-THEN-ELSE statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it will return the value in the ELSE clause. If there is no ELSE part and no conditions are true, it returns NULL. image man searchWeb31 Mar 2024 · The SQL CASE statement is a control flow tool that allows you to add if-else logic to a query. Generally speaking, you can use the CASE statement anywhere that … image manga seven deadly sinsWebCASING Statement. The CASE statement chooses from a sequence of conditions, and executes a corresponding statement. The CAS statement evaluates a single expression and compares it against several potential values, or evaluates multiple Boolean special and chose of first one that is TRUE.. Syntax. searched_case_statement ::= [ <> ] … image map highlight area onclick