case sql
The data types of input_expression and each when_expression must be the same or must be an implicit conversion.THEN result_expressionIs the expression returned when input_expression equals when_expr…
Because of this pairing, you might be tempted to call this SQL CASE WHEN, but CASE is the accepted term. The CASE statement goes through conditions and returns a value when the first condition is 条件分岐と言えば、プログラム言語にあるif文が代表格です。ところが、SQL文の中でも条件分岐を実現できます。CASE式を使うのですが、最初に知ったときは感動しました。プログラムのif文とSQLのCASE式、使い分けることで全体的にコードをスッキリさせることができます。例えばお知らせの新しい記事に「NEW」マークをつけたい場合にこの方法を使います。日付が現在から７日以内のときは1、そうでない場合は0を設定しています。これにis_newとでも名前を付けておきます。こうすると、のようなことをするか、DBからの取得結果に対して、foreachなどでフラグを設定することになるでしょう。例えば上記のようなテーブル（itemsテーブルとします。）でカテゴリーIDの1と4を入れ替えたい場合があります。上のテーブルを下のテーブルのような形にしたいときもUPDATE文の中でCASE式を使えば1クエリで可能です。By following users and tags, you can catch up information on technical fields that you are interested in as a wholeBy "stocking" the articles you like, you can search right awayWhy do not you register as a user and use Qiita more conveniently?You need to log in to use this function. The case statement in SQL returns a value on a specified condition. Qiita can be used more conveniently after logging in.You seem to be reading articles frequently this month. You can use the CASE statement within a SQL statement. La expresión CASE no se puede utilizar para controlar el flujo de ejecución de los bloques de instrucciones, funciones definidas por el usuario, procedimientos almacenados e instrucciones de Transact-SQL.
Using the The above query is an excellent place to use numbers instead of columns in the The SQL Server CASE Statement consists of at least one pair of WHEN and THEN statements. The SQL CASE Statement The CASE statement goes through conditions and returns a value when the first condition is met (like an IF-THEN-ELSE statement).
Write a query that selects all columns from Now, you might be thinking "why wouldn't I just use a But what if you also wanted to count a couple other conditions?
Write a query that calculates the combined weight of all underclass players (FR/SO) in California as well as the combined weight of all upperclass players (JR/SR) in California. We can use a Case statement in select queries along with Where, Order By and Group By clause. CASE WHEN v_workdept < 'B01' THEN UPDATE DEPT SET DEPTNAME = 'DATA ACCESS 1'; WHEN v_workdept < 'C01' THEN UPDATE DEPT SET DEPTNAME = 'DATA ACCESS 2'; ELSE UPDATE DEPT SET DEPTNAME = 'DATA ACCESS 3'; END CASE The first takes a variable called case_value and matches it with some statement_list. The following example uses the CASE expression to change the display of product line categories to make them more understandable. When a value does not exist, the text "Not for sale' is displayed.The following example uses the CASE expression in an UPDATE statement to determine the value that is set for the column
This occurs prior to evaluating the CASE expression.You should only depend on order of evaluation of the WHEN conditions for scalar expressions (including non-correlated sub-queries that return scalars), not for aggregate expressions.The following examples uses the CASE expression in an ORDER BY clause to determine the sort order of the rows based on a given column value. You can use the CASE statement within a SQL statement. Errors in evaluating these expressions are possible.
Example 2: Use a searched case statement WHEN clause to update column DEPTNAME in table DEPT, depending on the value of SQL variable v_workdept. The CASE statement is SQL's way of handling if/then logic. CASE expressions can be used within the SELECT statement, WHERE clauses, Order by clause, HAVING clauses, Insert, UPDATE and DELETE statements. It can be used in Insert statement as well. In this Oracle PL/SQL tutorial, learn CASE and SEARCHED CASE Statement. The CASE expression has two formats: simple CASE and searched CASE. So, once a condition is true, it will stop W3Schools is optimized for learning, testing, and training.
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