What's the difference when query using `in` and an array between two indexes?

问题: A collection in MongoDB with docs like below: {a: 1, b: 1} {a: 2, B: 2} {a: 3, B: 3} {a: 3, B: 2} {a: 2, B: 1} with uniq index a_1_b_1 or b_1_a_1 Query: {a: x, b: {...

  • 小编
  • 发布于 2019-05-19 21:38
  • 阅读 ( 84 )

SQL Server convert row values to columns

问题: I have an SQL table like this Name1 Name2 Department1 Department2 Location1 Location2 ------------------------------------------------------------------...

  • 小编
  • 发布于 2019-05-19 21:38
  • 阅读 ( 80 )

How to Fix Divide on sum from different group by

问题: anyone can help me, why this code didn't work if I put "GROUP BY DATE" sample value of DATE is 201810,201811,201812,201901 etc if I remove "GROUP BY DATE", its work but...

  • 小编
  • 发布于 2019-05-19 21:38
  • 阅读 ( 76 )

Get the last record of each user by eventid

问题: From the following db, id userid eventid created_at 1 1 100 2010-01-01 2 1 101 2010-02-01...

  • 小编
  • 发布于 2019-05-19 21:37
  • 阅读 ( 77 )

SQL: How to join two columns in a specific way?

问题: I am working with an Oracle Database and I am new to SQL in general. I have a table with data and month columns. After filtering the data I have just a few rows left. Bu...

  • 小编
  • 发布于 2019-05-19 21:37
  • 阅读 ( 72 )

How to get highest value for each group by checking with two columns value

问题: I have this table test_table below USER_ID | YEAR | MONEY ---------------------- 1 | 0 | 0 1 | 12 | 12 1 | 48 | 12 2 | 15 | 15 2 |...

  • 小编
  • 发布于 2019-05-19 21:37
  • 阅读 ( 69 )

Filter By date with format 'dd/mm'

问题: I have difficulty in syntax query dbms oracle for filtering by date, but i just want filter by date with format (dd/mm). and my data database record is (dd/mm/yyyy). How qu...

  • 小编
  • 发布于 2019-05-19 21:37
  • 阅读 ( 69 )

how to optimize sql when find the max record of each group while table is large?

问题: I have a table which contains nearly 1 million+ records. I want to find the max record of each group. Here is my sql: SELECT * FROM t WHERE id IN (SELECT max(id) AS id...

  • 小编
  • 发布于 2019-05-19 21:37
  • 阅读 ( 64 )

Extract only time from database where time is saving along with date in gridview

问题: What should I use to get only time in gridview I want to fetch only 03:42 but getting 01-01-1900 03:42:00 how to do this This is code cmd.CommandText = "select bumke...

  • 小编
  • 发布于 2019-05-19 21:36
  • 阅读 ( 59 )

How to return null when not matched (Opposite of nullif function)

问题: I want to get null when both exp are not matched like nullif(exp1,exp2) will return null when same and return first exp when not same. i have tried with the help of sub q...

  • 小编
  • 发布于 2019-05-19 21:36
  • 阅读 ( 61 )

How to get record for highest value based on type and 2 columns

问题: So I have a table here called my_table | userid | gender | year | money | | ------ | ------ | ---- | ----- | | 1 | B | 12 | 50 | | 1 | B | 24 |...

  • 小编
  • 发布于 2019-05-19 21:36
  • 阅读 ( 12 )

SQL Server create centroid of a polygon inside of a polygon

问题: I would like to create a centroid of a polygon (type geometry) such that the centroid falls inside of the polygon I have tried with function shape.STCentroid() which is c...

  • 小编
  • 发布于 2019-05-19 21:36
  • 阅读 ( 10 )

SQL Case expression in Join clause

问题: I have 2 tables as follows table1 id | date ------+--------------------- 1 | 1/12/2017 1 | 3/12/2017 1 | 10/2/2018 1 | 10/4...

  • 小编
  • 发布于 2019-05-19 21:36
  • 阅读 ( 13 )

How can I select all tables with a certain amount of foreign keys in them?

问题: How can I select all tables from a database which have for example one foreign key in it? Can I as well get all tables in my database in ascending order in regard of the nu...

  • 小编
  • 发布于 2019-05-19 21:35
  • 阅读 ( 12 )

Building a dynamic PHP prepared statement from user entry

问题: I have a database with student records, about 50 or so columns, all of which need to be searchable. I'm familiar with how to build a dynamic search query by appending field...

  • 小编
  • 发布于 2019-05-19 21:35
  • 阅读 ( 20 )

Change ngx-pagination CSS

问题: How can I change ngx-pagination CSS? I tried with: :host /deep/ .ngx-pagination { padding-left: 0px; } :host /deep/.ngx-pagination .current, .btn-info { background:...

  • 小编
  • 发布于 2019-04-01 21:02
  • 阅读 ( 196 )

toggleClass in jQuery skips css rule

问题: I have a div of id="header" with initial css rule: padding: 25px 0;. When scrolling down the page, I want to decrease this div's padding: $(document).ready(function() {...

  • 小编
  • 发布于 2019-04-01 21:01
  • 阅读 ( 146 )

Cannot resolve symbol “FirebaseRecyclerOptions”

问题: I am making a chat messenger via Firebase but my Android Studio 2.3.2 cannot resolve the symbol of FirebaseRecyclerOptions<> even my app is successfully connected wit...

  • 小编
  • 发布于 2019-04-01 21:00
  • 阅读 ( 197 )

How to reset Backgroud color of a radio button?

问题: I am just trying to reset background color of radio button. Already i have set color for radio button and its text along with background perfectly.Later to reset text color...

  • 小编
  • 发布于 2019-04-01 21:00
  • 阅读 ( 139 )

How to fix null pointer for “resp” while observing the value of live data

问题: My code works fine with view model but when I start observing the value using live data in model.d.observe(this, Observer<RespCategories> { r->r...

  • 小编
  • 发布于 2019-04-01 21:00
  • 阅读 ( 136 )
部分文章转自于网络,若有侵权请联系我们删除