[英]How to update a single column with multiple data in oracle 12c
I am updating an oracle table, same column with multiple data. 我正在更新一个Oracle表,同一列具有多个数据。 How do i write the code? 我该如何编写代码?
I run this code but had error.. 我运行此代码,但有错误..
I am replacing Boy with Girl, Black with White and Green with Color. 我要用女孩代替男孩,用白色代替黑色,用颜色代替绿色。
UPDATE BIG
SET
FNAME = CASE
WHEN FNAME = 'BOY' THEN 'GIRL'
WHEN FNAME = 'BLACK' THEN 'WHITE'
WHEN FNAME = 'GREEN' THEN 'COLOR'
END;
I need to be able to write a single statement that can update same column with different and multiple data. 我需要能够编写一条语句来使用不同的多个数据更新同一列。
You need to handle ELSE
(all rows will be updated some using A -> A (identity): 您需要处理ELSE
(所有行将使用A-> A(身份)进行更新:
UPDATE BIG
SET
FNAME = CASE FNAME
WHEN 'BOY' THEN 'GIRL'
WHEN 'BLACK' THEN 'WHITE'
WHEN 'GREEN' THEN 'COLOR'
ELSE FNAME
END;
or better filter rows you want to update: 或更好地过滤要更新的行:
UPDATE BIG
SET
FNAME = CASE
WHEN FNAME = 'BOY' THEN 'GIRL'
WHEN FNAME = 'BLACK' THEN 'WHITE'
WHEN FNAME = 'GREEN' THEN 'COLOR'
END;
WHERE FNAME IN('BOY', 'BLACK', 'GREEN');
<=>
UPDATE BIG
SET FNAME = DECODE(FNAME, 'BOY', 'GIRL', 'BLACK', 'WHITE', 'GREEN', 'COLOR')
WHERE FNAME IN('BOY', 'BLACK', 'GREEN');
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