How update just the day of a date value?

Example:

Table: FC_GQ_SOURCE_ANALYSIS

Sample_type = C

Effective_date = null

Sample_date = 20/13/07/14 09:00

Should that happen, it's for any analysis of the sample which has a 'C' sample_type we need for the entry into force the first day of the month for some months of the date of the sample is and keep the time that it is...

so in the example data, the entry into force should be 2013/07/01 09:00.

How to update only the part of the day of this string of date?

Hello

You don't need to convert it to a string and back to do.  TRUNC allows to get the right day and date arithmetic to get the right time, like this:

UPDATE fc_gq_source_analysis

SET effective_date = TRUNC (sample_date, 'MONTH')

+ (sample_date - TRUNC (sample_date))

WHERE sample_type = 'C '.

;

TRUNC (sample_date, 'MONTH') is midnight the 1st of the month you want.

sample_date - TRUNC (sample_date) is the time you want, expressed in number of days (for example, 9/24 a day).

Tags: Database

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