what is fact and dimension table in data warehousing

Linked mode (full update capabilities)What I want to highlight here is the IMEX parameter, because different patterns represent different reading and writing behaviors:When imex=0 is "Export mode", the Excel file opened by this mode can only be used for "write" purposes.When Imex=1 is "Import Mode", the Excel file ope

Depending on the data mining that you've heard or seen countless times, do you know what that is? Many scholars and experts give different definitions of what data mining is, and here are a few common statements:"To put it simply,

-Discussion: when the data volume is a little large (hundreds of thousands, join table query/subquery/use PHP to gradually analyze the results multiple times the advantages and disadvantages of a single table query and selection first let's talk about the current situation of this project the main

= 0 p = 'sort AGGREGATE (cr = 2 pr = 2 pw = 0 time = 0 us )'STAT #2 id = 2 cnt = 1 pid = 1 pos = 1 bj = 69559 p = 'index range scan IDX_T_DETAIL (cr = 2 pr = 2 pw = 0 time = 0 us cost = 1 size = 13 card = 1)' -- What are the two read data blocks? Table or index data block-- We can see that the objects in the above TRA

requires only 3 bytes, less than timestamp. It is not recommended to store the value of a UNIX timestamp through the int type class, because it is too intuitive to cause unnecessary trouble with maintenance and does not bring any benefits.4.ENUM SET:For the Status field, you can try to use an ENUM to store it because you can greatly reduce storage space, and even if you need to add a new type, modifying t

What is the problem with this php file? How to enable PHP to automatically jump to this value link after writing data to the database Defined ('pcpay _ path') or exit; class record_control extends admin_control {public function add () {$ uid = $ this-> _ user ['uid']; if (empty ($ _ POST) {$ this-> _ pkey = 'content'; $ this-> _ ukey = 'record-add '; $ this-> _ t

the naming service and directory service are for.The most effective way to learn new concepts and knowledge is by contacting and comparing them with what they have learned before. About the naming service, in fact, we often use it, but do not know it is it, more typical domain name server DNS (domains naming service),

This is a method I wrote in the model file. I want to make an external join (leftjoin) between a table (t) and another table c ). {Code ...} but the data found now is such {code ...} all these fields are in the t table, and there

database", in the popup dialog, we use the mouse to click on the red circle, Next, we select the target connection we want to synchronize, select the "Target" connection and click the "Compare" button, then go to:And you will find that our "T_pricing_order" does not show here, yes, exactly what we did not give us the new "t_pricing_order" table, when designing the tabl