I have a table with with one column for product dimensions.
example rows:
16" L x 22" W x 6" H
22.5" L x 12" W x 9" H
I am trying to get the length, width, and height into separate columns. I have to use SQL because this is being used in a software integration that only accepts SQL statements. I am thinking I have to go the route of regex.
SQL Statement to get the data so far
SELECT TOP 10
[ID]
,substring([SHIP_DIMENSIONS],PATINDEX('%[0-9]\"%',[SHIP_DIMENSIONS]),2) as Length
,substring([SHIP_DIMENSIONS],PATINDEX('%[0-9]\"%',[SHIP_DIMENSIONS]),2) as Width
,substring([SHIP_DIMENSIONS],PATINDEX('%[0-9]*\"%',[SHIP_DIMENSIONS]),2) as Height
FROM [PART]
I need the output to be
Length | Width | Height
16 | 22 | 6
22.5 | 12 | 9
Any suggestions would be greatly appreciated.
One way to do it is as follows:
select
left(dim, charindex('" L', dim)-1) as [Length]
, substring(dim, charindex('" L', dim)+6, charindex('" W', dim)-charindex('" L x ', dim) - 6) as [Width]
, substring(dim, charindex('" W', dim)+6, charindex('" H', dim)-charindex('" W x ', dim) - 6) as [Height]
from test
The idea is to look for the markers that you have in your text, and use them to parcel out the string into substrings. This approach is very rigid, in that it assumes that the pattern shown in your example is followed precisely in all your records, i.e. all the markers are present, along with the spaces. There is also an implicit assumption that all dimensions are in inches. What can vary is the width of the columns.
Demo.
Note: I am assuming that you are dealing with a legacy database, so there is no way to do the right thing (which is to separate out the dimensions into separate columns).
Related
You’re given a chess board with dimension n x n. There’s a king at the bottom right square of the board marked with s. The king needs to reach the top left square marked with e. The rest of the squares are labeled either with an integer p (marking a point) or with x marking an obstacle. Note that the king can move up, left and up-left (diagonal) only. Find the maximum points the king can collect and the number of such paths the king can take in order to do so.
Input Format
The first line of input consists of an integer t. This is the number of test cases. Each test case contains a number n which denotes the size of board. This is followed by n lines each containing n space separated tokens.
Output Format
For each case, print in a separate line the maximum points that can be collected and the number of paths available in order to ensure maximum, both values separated by a space. If e is unreachable from s, print 0 0.
Sample Input
3
3
e 2 3
2 x 2
1 2 s
3
e 1 2
1 x 1
2 1 s
3
e 1 1
x x x
1 1 s
Sample Output
7 1
4 2
0 0
Constraints
1 <= t <= 100
2 <= n <= 200
1 <= p <= 9
I think this problem could be solved using dynamic-programing. We could use dp[i,j] to calculate the best number of points you can obtain by going from the right bottom corner to the i,j position. We can calculate dp[i,j], for a valid i,j, based on dp[i+1,j], dp[i,j+1] and dp[i+1,j+1] if this are valid positions(not out of the matrix or marked as x) and adding them the points obtained in the i,j cell. You should start computing from the bottom right corner to the left top, row by row and beginning from the last column.
For the number of ways you can add a new matrix ways and use it to store the number of ways.
This is an example code to show the idea:
dp[i,j] = dp[i+1,j+1] + board[i,j]
ways[i,j] = ways[i+1,j+1]
if dp[i,j] < dp[i+1,j] + board[i,j]:
dp[i,j] = dp[i+1,j] + board[i,j]
ways[i,j] = ways[i+1,j]
elif dp[i,j] == dp[i+1,j] + board[i,j]:
ways[i,j] += ways[i+1,j]
# check for i,j+1
This assuming all positions are valid.
The final result is stored in dp[0,0] and ways[0,0].
Brief Overview:
This problem can be solved through recursive method call, starting from nn till it reaches 00 which is the king's destination.
For the detailed explanation and the solution for this problem,check it out here -> https://www.callstacker.com/detail/algorithm-1
I have a technical issue with access graphs: I have a table in Access database with 4 fields: xValue, yValue, round, partOfRound
What I want: there are always 2 rounds, each round has 2 parts. I need to get a series per round per part (so from round 1 part 1, round 1 part 2, round 2 part 1, round 2 part 2) with all xValues and yValues in a chart.
But then I have an other problem:The xValue isn't a good number to show, this is needing to be this number divided by a number from an other table (see this as number in table3) where the row of table 3 equels the identifier with the identifier I use for my chart. (IDtable2=IDtable3)
The final result will be 4 lines with the data in my graph, so 4 series.
But when I use the wizard for making graphs, I can only set 1 field to the series value, so it will see a round as just 1 series instead of 2.
How do I solve this problem?
Kind regards
Kristof
What type of graph - just a column?
Concatenate the round and partOfRound fields.
Try changing the graph RowSource to:
TRANSFORM Sum(Table2.yValue) AS SumOfyValue SELECT Table2.xValue FROM Table2 GROUP BY Table2.xValue PIVOT [round] & "_" & [partOfRound];
Possible SQL to include table join to calculate the division:
TRANSFORM Sum(Table2.yValue) AS SumOfyValue
SELECT Round([xValue]/[Factor],0) AS x
FROM Table3 INNER JOIN Table2 ON Table3.PK_Table3 = Table2.FK_Table3
GROUP BY Round([xValue]/[Factor],0)
PIVOT [round] & "_" & [partOfRound];
For both queries, I had to open the graph editor (double click the graph) and from the menu click on "By Column" button to get the x values on the x axis.
I do hope round is not an actual name as it is a reserved word and should not use reserved words as names for anything.
Suppose I have a table as follows:
id name length
1 A 21.5
2 B 12.4
3 C 0
4 D 17
5 E 1
I wish to get:
id name length
1 A 21.5
5 E 1
Meaning all rows that hase length that ends up with 1.
length is a numeric column.
It's very simple thing to do with programing languages but it seems quite not natural for SQL. How can I do that efficiently and simply?
My only thought is to convert the field to Text and then lose eveything after the . then convert it to array and choose the letter in the position of array length. This will probebly work but it seems like a very bad solution.
You can use FLOOR and modulo division:
SELECT *
FROM tab
WHERE FLOOR(length) % 10 = 1;
SqlFiddleDemo
I need to store 5 values in a single SQL Server column, each range 1-90. The values cannot be repeated. I though of using the 2, 4, 8, 16, 32, 64, ... system but you guess it will get really big, using decimal I risk wrong calculation. Is there a convenient way to:
store the 5 values into a single column so that to avoid having 90 bit column in the table, see my previous post here.
quickly query the database for example to return all records with number X and Y
another option was a string (90) containing flags like 000001000011000 but this way I have to use substrings to query and I fear it will slow down on a table with 25.000 records or more.
First request: You say most are bit. But if not all then you cant use bitwise operator. And can't save it in a single field
In that case you need an aditional table.
Row_id | fieldName | fieldValue
1 | name1 | value1
1 | name2 | value2
.
.
.
1 | name90 | value90
Second request: Save the 5 values is very easy and fast on the aditional table. Just create and index for row_id on both tables.
Third Request: Here you say again can save it as bits. But instead using strings, that is a bad idea.
Your are right, number isnt big enough to hold 90 bit, that is because a number can only hold 32 or 64 bits depending on type.
In that case you need to use two field (64 bits) or three field (32 bits) to store all 90 possible flags.
Again easy to do and really fast.
EDIT
For use multiple fields you have to create categories
Like imagine there are 16 bits split into two 8 bits (0..256)
01234567 89ABCDEF
01010101 11111111
Create fieldUp and fieldDown
SAVE
FieldUp = 01234567
FieldUp = 1 + 4 + 16 + 64
FieldDown = 89ABCDEF
FieldDown = 1 + 2 + 4 + 8 + 16 + 32 + 64 + 128
Then Select a row with FLAGS [b1, b5, bA] would be
SELECT *
FROM TABLE
WHERE FieldUp & (4 + 32)
AND FieldDown & 8
I have resolved saving the numbers comma separated, then in my code i split this field into an array and can process the data. Numbers are not meant for math operations but just as a string.
Total newbie here, regarding sqlite, so don't flame too hard :)
I have a table:
index name length L breadth B height H
1 M-1234 10 5 2
2 M-2345 20 10 3
3 ....
How do I put some tabular data (let' say ten x,y values) corresponding to index 1, then another table to index 2, and then another, etc. In short, so that I have a table of x and y values that is "connected" to first row, then another that is connected to second row.
I'm reading some tutorials on sqlite3 (which I'm using), but am having trouble finding this. If anyone knows a good newbie tutorial or a book dealing with sqlite3 (CLI) I'm all ears for that too :)
You are just looking for information on joins and the concept of foreign key, that although SQLite3 doesn't enforce, is what you need. You can go without it, anyway.
In your situation you can either add two "columns" to your table, being one x and another y, or create a new table with 3 "columns": foreign_index, x and y. Which one to use depends on what you are trying to accomplish, performance and maintainability.
If you go the linked table route, you'd end up with two tables, like this:
MyTable
index name length L breadth B height H
1 M-1234 10 5 2
2 M-2345 20 10 3
3 ....
XandY
foreign_index x y
1 12 9
2 8 7
3 ...
When you want the x and y values of your element, you just use something like SELECT x, y FROM XandY WHERE foreign_index = $idx;
To get all the related attributes, you just do a JOIN:
SELECT index, name, length, breadth, height, x, y FROM MyTable INNER JOIN XandY ON MyTable.index = XandY.foreign_index;