denormalized

Storing Multiple Checkbox Data in MySQL Database with PHP

由 半腔热情 提交于 2019-12-21 02:15:02
问题 I want to have multiple checkbox values be stored into one field in a database. (Ex. 1, 24,56,100). I am wanting to know how I can make this happen, and how does PHP read these values from the database if I want to call variables in a query? Basically I am creating a blog app (for fun and experience) and I want the user to be able to change the visibility of each blog post through checkboxes. I know you are probably thinking why don't I just have a visibility field for each blog post. I

Oracle SQL getting the nth element regexp

由 最后都变了- 提交于 2019-12-19 06:56:51
问题 I am trying to get the nth element in a comma separated string using SQL in Oracle. I have the following so far.. SELECT regexp_substr( '100016154,5101884LT00001,,,,,100000010892100000012655,L,SEI,5101884LT00001,1,SL,3595.03,00,2,N,N,G,N', '[^,]+', 1, 7) FROM dual; but it doesn't work when the element is empty i.e. ,, can anyone help? 回答1: If your delimited values are always alphanumeric in between the commas then you could try: SELECT REGEXP_SUBSTR( <delimied_string>, '[[:alnum:]]{0,},', 1,

Is it possible to query a comma separated column for a specific value?

由 孤人 提交于 2019-12-17 04:08:32
问题 I have (and don't own, so I can't change) a table with a layout similar to this. ID | CATEGORIES --------------- 1 | c1 2 | c2,c3 3 | c3,c2 4 | c3 5 | c4,c8,c5,c100 I need to return the rows that contain a specific category id. I starting by writing the queries with LIKE statements, because the values can be anywhere in the string SELECT id FROM table WHERE categories LIKE '%c2%'; Would return rows 2 and 3 SELECT id FROM table WHERE categories LIKE '%c3%' and categories LIKE '%c2%'; Would

How to deal with relationships while using mongodb

由 坚强是说给别人听的谎言 提交于 2019-12-13 17:59:43
问题 I know, think in "denormalized way" or "nosql way". but tell me about this simple use-case. db.users db.comments some user post a comment, and i want to fetch some user data while fetching a comment. say i want to show dynamic data, like "userlevel", and static data like "username". with the static data i will never have problems, but what about the dynamic data? userlevel is in users collation, i need the denormalized data duplicated into comments to archieve read performance but also having

can I denormalize multiple large tables in bigquery

由 三世轮回 提交于 2019-12-12 03:47:21
问题 Can I denormalize (by joining) multiple large tables in bigquery? Table1 is 400M rows Table2 is 2M rows Table3 is 800K rows If not, do I have to do it in my relational database before I upload? That would be a difficult solution. Should I chunk the tables into smaller pieces and run iterations of joins over the tables so that it is always large to small? This would also be a difficult solution. Thank you. 回答1: BigQuery now supports "Big JOINs" which allows you skip the LIMIT's in your JOIN

How do we build Normalized text file from DeNormalized one?

由 99封情书 提交于 2019-12-11 20:23:31
问题 Thanks for your replies/time. We need to build a Normalized text file from DeNormalized text file . We explored couple of options such as unix shell , and Loading into data base etc. I am looking pick up better ideas for resolutions from this community. The input text file is various length with comma delimited records. The content may look like this: **XXXXXXXXXX , YYYYYYYYYY, TTTTTTTTTTT, UUUUUUUUUU, RRRRRRRRR,JJJJJJJJJ 111111111111, 22222222222, 333333333333, 44444444, 5555555, 666666

SQL - How to check if item is in a list in a record

由 我与影子孤独终老i 提交于 2019-12-11 03:16:32
问题 I have have a column name MyRoles that contains a list of items (integers) stored in a field named UserRoles. I want to write a query that checks to see if a specific item is in the list. The list will look like this: "1,2,3" I can't use WHERE MyRoles What should the query look like? This is similar to what I am thinking: SELECT * FROM MyTable WHERE MyRoles CONTAINS ('1') The fact that no answer was easy to implement and would take me farther down an ugly road really makes clear that a

Denormalize/flatten list of nested objects into dot separated key value pairs

由 寵の児 提交于 2019-12-08 09:19:30
问题 It would have simpler if my nested objects were dictionaries, but these are list of dictionaries. Example: all_objs1 = [{ 'a': 1, 'b': [{'ba': 2, 'bb': 3}, {'ba': 21, 'bb': 31}], 'c': 4 }, { 'a': 11, 'b': [{'ba': 22, 'bb': 33, 'bc': [{'h': 1, 'e': 2}]}], 'c': 44 }] I expect output in following format: [ {'a': 1, 'b.ba': 2, 'b.bb': 3, 'c': 4}, {'a': 1, 'b.ba': 21, 'b.bb': 31, 'c': 4}, {'a': 11, 'b.ba': 22, 'b.bb': 33, 'bc.h': 1, 'bc.e': 2, 'c': 44}, ] Basically, number of flattened objects

Denormalize/flatten list of nested objects into dot separated key value pairs

由 China☆狼群 提交于 2019-12-06 16:36:11
It would have simpler if my nested objects were dictionaries, but these are list of dictionaries. Example: all_objs1 = [{ 'a': 1, 'b': [{'ba': 2, 'bb': 3}, {'ba': 21, 'bb': 31}], 'c': 4 }, { 'a': 11, 'b': [{'ba': 22, 'bb': 33, 'bc': [{'h': 1, 'e': 2}]}], 'c': 44 }] I expect output in following format: [ {'a': 1, 'b.ba': 2, 'b.bb': 3, 'c': 4}, {'a': 1, 'b.ba': 21, 'b.bb': 31, 'c': 4}, {'a': 11, 'b.ba': 22, 'b.bb': 33, 'bc.h': 1, 'bc.e': 2, 'c': 44}, ] Basically, number of flattened objects generated will be equal to (obj * depth) With my current code: def flatten(obj, flattened_obj, last_key=''

Export denormalized data from excel to xml

由 拥有回忆 提交于 2019-12-06 03:30:30
问题 We are trying to export an excel table with "Denormalized Data" to xml. The table headers are as follows: | AssetManager Code | AssetManager Date | Portfolio Code | Portfolio Name | MarketValue | NetCashFlow | Field | Field Code | Field Name | The AssetManager Code and AssetManager Date are the same throughout, the rest of the columns contain variable data. Here is an example of the xml output we want: <AssetManager Code="PFM" Date="20130117"> <Portfolios> <Portfolio Code="CC PSP" Name=
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