I want to know the difference between iphoto master folder and previews folder

I want to know the difference between iphoto library master folder and previews folder.. my pictures is stored in master but part of them is also copied into previews.. it occupied too much space.. if I can't change anything in iphoto library, any way to save the space for iphoto? 70G for almost 15,000 pictures, is it reasonable?
i use mac book pro, ilife 11..

70GB for 15,000 photos is reasonable, yes, if the photo files are large.
DO NOT meddle with the contents of your iPhoto Library in any other way than using the commands available in the iPhoto application. What appear to be duplicate files stored in different parts of the library are NOT duplicates, and if you attempt to save space by deleting things in the Finder, you will wreck your library and land in a world of trouble.

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I want to know the difference between Days column and Day1 Column

Hi All,
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Days
Day1
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10/26/2013 3:06:59 PM
I want to know the difference between Days column and Day1 column and why the days column didnt show the time
Please anyone help.....
Regards
Shagar M

Pleiadian wrote:
It is the decode statement that is doing this.
The format of decode is:
decode(expression, search1, result1, search2, result2, searchn, resultn, default)
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In your example (the decode for the field Days) the first result is a NULL. I suspect (gurus? anyone?) that Oracle will use the varchar2 overload of the decode statement, and the date field will be converted to varchar2 using your NLS_DATE_FORMAT settings.
In the second decode statment (Day1) the first result is of datatype date, so the result of the decode statement will be a date field (and will be parsed as such by your sql development tool)
I agree, as NULL is the first result returned the datatype is undetermined, so Oracle is picking VARCHAR2 over others, and causing an implicit datatype conversion on the resultant date value, whereas the other which is returned as a date will use the local settings of the client tool being used.
I can replicate the 'issue' in Toad, and it's rectified if we cast the first returned value of the decode statement...
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DECODE ('I', 'I', SYSDATE + 1) Day1
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Hashes tables have no internal linear index. You can only access hashed tables by specifying the key. The response time is constant, regardless of the number of table entries, since the search uses a hash algorithm. The key of a hashed table must be unique, and you must specify UNIQUE in the table definition.
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Sebastien_Lorquet wrote:
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I want to know the difference between iphoto master folder and previews folder

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