WebNov 11, 2024 · 1 where句でcase文が使えますので、 A,B,C カラムをwhere句のcase文でご参照ください。 上記のようなアルゴリズムを導入するのに適したoracleでの文法は nvl と greatest を併用して、Aがない時はBとCの大きい値を参照する方法です。 ただし質問文の条件ではBとCが同値の場合の挙動が記述されていませんので、要求に合わせた改修を … WebThe PostgreSQL CASE expression is the same as IF/ELSE statement in other programming languages. It allows you to add if-else logic to the query to form a powerful query. Since CASE is an expression, you can use it in any places where an expression can be used e.g., SELECT, WHERE, GROUP BY, and HAVING clause.
Is there any way in Postgres to parameterise a procedure for sort order …
Web如果您可以跳過整個雙頁,那么您需要一個行生成器來包含丟失的頁面,並且可以使用: SELECT MAX(CASE MOD(p.pagenum, 2) WHEN 0 THEN t.title END) AS left, MAX(CASE MOD(p.pagenum, 2) WHEN 1 THEN t.title END) AS right, LISTAGG(p.pagenum, ',') WITHIN GROUP (ORDER BY p.pagenum) AS pages FROM ( SELECT LEVEL - 1 AS pagenum FROM … WebFeb 9, 2024 · ORDER BY can be applied to the result of a UNION, INTERSECT, or EXCEPT combination, but in this case it is only permitted to sort by output column names or … flowers sympathy card
PostgreSQL — Using CASE inside ORDER BY Clause - Medium
WebOrdering by a CASE expression. The ORDER BY clause can include CASE expressions to specify a sorting key. In the following example, column a_col of table tab_case is of type … WebThe PostgreSQL CASE expression is the same as IF/ELSE statement in other programming languages. It allows you to add if-else logic to the query to form a powerful query. Since … WebApr 15, 2024 · –获取所有数据库Select * FROM Master..SysDatabases order by Name. ... SELECT表名 =case when a .colorder= 1 then d.name else ” end ,表说明 =case when a .colorder= 1 then isnull(f .value, ”) else ” end,字段序号 =a. colorder,字段名 =a. name,标识 =case when COLUMNPROPERTY ( a .id, a.name ,’IsIdentity’)= 1 then ‘√ ... green bottle of lotion