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2012/3/15 -select decode(type_id, null, 'Unknown', type_id), name, count(*) from ( select 'asdf' type_id, 'name1' name from dual union all select ...

In a DECODE function, Oracle considers two nulls to be equivalent. If expr is null, then Oracle returns the result of the first search that is also null.

2024/8/6 -The DECODE() function also handles NULL values differently in two ways. For one thing, DECODE() acts as though two NULL values are equivalent.

If no matches are found, the DECODE function will return default. If default is omitted, then the DECODE function will return NULL (if no matches are found).

2012/9/19 -DECODE関数ではNULL=NULLの評価はできる。 CASE式の場合、WHEN句でIS NULLを使わないと駄目。 らしい。 つまりどーゆーこと(--?

In Oracle, you can use DECODE function to evaluate a list of expressions, and if a value is matched return the corresponding result. In SQL Server, you can ...

A.b. 表で定義されているデータタイプがNot salesは数値型だから返される。 c. NO_COMMISIONはvarchar2などの文字列だからエラーとなる。 そういう事だと思うが?

A.数値→文字の変換は、 CASE WHEN 0 < ABS(値) AND ABS(値) < 1 THEN REPLACE(TO_CHAR(値), '.', '0.') ELSE TO...

2018/2/12 -PowerCenter does allow NULL values in the value list of a DECODE() function. However, according to all explanations I've found in the ...

2016/9/6 -In a DECODE function, Oracle considers two nulls to be equivalent. If expr is null, then Oracle returns the result of the first search that is ...

2016/12/23 -パターン1: NVL2関数 を使う · NVL2(col_name, ; パターン2: DECODE関数 を使う · DECODE(col_name, ; パターン3: 検索CASE式 を使う · CASE WHEN col_name ...

2025/2/21 -If there are no matches, the DECODE function will return default and if default is omitted, then the function will return NULL. Learn more about ...