How to write formula to get data from two tables linked together by one column
Hi ,
I am new to crystal report. I have a problem to create formula :
Let's say :
I have two tables :
tbl_Details :
Emp_id Emp_nameEmp_Deptt
1 Ram MMM
2 Naresh NNN
3 kapil HHH
4 Namita DDD
tbl_Mapping :
Col_1 Col_2 Emp_Deptt
ButterSotch ButterScotch NNN
ButterScotch Strawberry DDD
Olive Starch MMM
Olive Olive HHH
Note : In the above tables, Emp_Deptt column is same.
Now i want to create a formula like as below :
if Mapping.Type1 = Mapping.Type2 then find Emp_Deptt in Details table and get the Emp_name.
for example :
Butterscotch = Butterscotch then Emp_Deptt is NNN matched with Details table and the Emp_name is Naresh.
if doesn't find any match then nothing to do.
Now, i want to create a formula to get the desired value and print place somewhere in crystal report.
you need to make view of the tables first, join the the two tables, tbl_Deetails with tbl_Mapping..
link them with the department ID.. once its done, call that view to the report and use the formula like this
if(totext({view.Type1}) == totext({view.Type2})) then
(
{view.Employee_Name};
)
else
(
//nothing
)
Related
I hava one MySQL Table
id name birthdate city
1 Owen 2011/01/01 USA
2 Mark 2012/05/01 UK
3 Marry 2011/01/01 JP
4 John 2011/01/01 JP
First，I uesd jqgrid to read all row data. But Now,I want to know when birthdate=2011/01/01，how many different city in the table.
Can don't used sql，only used jqgrid plugin?
You are looking for distinct function.
SELECT DISTINCT(city) FROM table WHERE birthday = "2011/01/01";
I'm trying to write a spring batch to move data from two tables to a single table. I'm having a problem now and I thought of many ways to solve this problem but I'm still wondering if there is a more efficent solution to my problem?
Basically the problem is, I have two tables lets call them table A and table B and their structure is as the following:
table A
column 1A column 2A
======== ========
bmw 123555
nissan 123456777
audi 12888
toyota 9800765
kia 85834945
table B
column 1B column 2B
======== ========
12 caraudi
123456 carnissan
123 carbmw
0125 carvvv
88963 carbbn
what I'm trying to do is to create a table c from the batch's wrtier which holds all the data from table B (column 1B and column 2B)and column 1A only without losing any data from both tables and without writing duplicated data based on column 2A and column 1B. column A and column B have only one column in common (coulmn 1B == column 2A) but column 2A has a 3 digits suffix added to each id so if we do a join and compare I have to use a substr method and it will be very slow coz I have huge tables.
The other solution I thinked of is to have a reader for table A and write all results to tempA table without the suffix, then another reader that compare tables tempA and table B and write the data to table c as the following
table c
column 1A ( can be nullable because not all the records in column 2A exists in column 1B)
column 1B
column 2B
so the table will look like this
table C
column 1c column 2c column 3c
========= ========= =========
12 caraudi audi
123456 carnissan nissan
123 carbmw bmw
0125 carvv
88963 carbbn
9800765 toyota
85834945 kia
is this the bet way to solve the problem? or is there any other way that is more efficient?
thanks in advance!
Before giving up on a LEFT OUTER JOIN from tableA to tableB (or a FULL OUTER JOIN if your query conditions require it) consider using db2expln or the Visual Explain utility in IBM Data Studio to determine the cost of some alternative ways to perform a "begins with" match on VARCHAR columns:
ON a.col2a LIKE b.col1b || '___'
ON a.col2a >= b.col1b || '000' AND a.col2a <= b.col1b || '999'
If 1b is a CHAR column, you might need to trim off its trailing spaces before concatenating additional characters to it: RTRIM( b.col1b ) || '000'
Assuming column 1b is indexed, one prefix-based matching predicate or another is bound to make a join between those two tables less expensive than creating, populating, and joining to your own temp table. If I'm wrong (or there are other complicating factors) and a temp table ends up being the best option, be sure to use a declared global temporary table (DGTT) so you can avoid the logging overhead of populating it.
I am using the following hive query script for the version 0.13.0
DROP TABLE IF EXISTS movies.movierating;
DROP TABLE IF EXISTS movies.list;
DROP TABLE IF EXISTS movies.rating;
DROP DATABASE IF EXISTS movies;
ADD JAR /usr/local/hadoop/hive/hive/lib/RegexLoader.jar;
CREATE DATABASE IF NOT EXISTS movies;
CREATE EXTERNAL TABLE IF NOT EXISTS movies.list (id STRING, name STRING, genre STRING)
ROW FORMAT SERDE 'com.cisco.hadoop.loaders.RegexSerDe'with SERDEPROPERTIES(
"input.regex"="^(.*)\\:\\:(.*)\\:\\:(.*)$",
"output.format.string"="%1$s %2$s %3$s");
CREATE EXTERNAL TABLE IF NOT EXISTS movies.rating (id STRING, userid STRING, rating STRING, timestamp STRING)
ROW FORMAT SERDE 'com.cisco.hadoop.loaders.RegexSerDe'
with SERDEPROPERTIES(
"input.regex"="^(.*)\\:\\:(.*)\\:\\:(.*)\\:\\:(.*)$",
"output.format.string"="%1$s %2$s %3$s %4$s");
LOAD DATA LOCAL INPATH 'ml-10M100K/movies.dat' into TABLE movies.list;
LOAD DATA LOCAL INPATH 'ml-10M100K/ratings.dat' into TABLE movies.rating;
CREATE TABLE movies.movierating(id STRING, name STRING, genre STRING, rating STRING);
INSERT OVERWRITE TABLE movies.movierating
SELECT list.id, list.name, list.genre, rating.rating from movies.list list LEFT JOIN movies.rating rating ON (list.id=rating.id) GROUP BY list.id;
The issue is when I execute the script without the "GROUP BY" clause it works fine.
But when I execute it with the "GROUP BY" clause, I get the following error
FAILED: SemanticException [Error 10002]: Line 4:21 Invalid column reference 'name'
Any ideas what is happening here?
Appreciate your help
Thanks!
If you group by a column, your select statement can only select a) that column, b) columns derived only from that column, or c) a UDAF applied to other columns.
In this case, you're only grouping by list.id, so when you try to select list.name, that's invalid. Think about it this way: what if your list table contained the following two entries:
id|name |genre
--+-----+------
01|name1|comedy
01|name2|horror
What would you expect this query to return:
select list.id, list.name, list.genre from list group by list.id;
In this case it's nonsensical. I'm guessing that id in reality is a primary key, but note that hive does not know this, so the above data set is perfectly valid.
With all that in mind, it's not clear to me how to fix it because I don't know the desired output. For example, let's say without the group by (just the join), you have as output:
id|name |genre |rating
--+-----+------+-------
01|name1|comedy|'pretty good'
01|name1|comedy|'bad'
02|name2|horror|'9/10'
03|name3|action|NULL
What would you want the output to be with the group by? What are you trying to accomplish by doing the group by?
OK let me see if I can ask this in a better way.
Here are my two tables
Movies list table - Consists of movies information
ID | Movie Name | Genre
1 | Movie 1 | comedy
2 | movie 2 | action
3 | movie 3 | thriller
And I have ratings table
MOVIE_ID | USER ID | RATING on 5 | TIMESTAMP
1 | xyz | 5 | 12345612
1 | abc | 4 | 23232312
2 | zvc | 1 | 12321123
2 | zyx | 2 | 12312312
What I would like to do is get the output in the following way:
Movie ID | Movie Name | Genre | Rating Average
1 | Movie 1 | comedy | 4.5
2 | Movie 2 | action | 1.5
I am not a db expert but I understand this, when you group the data together you need to convert the multiple values to the scalar values or all the values, if string should be same right?
For example in my previous case, I was grouping them together as a string. So which is okay for list.id, list.name and list.genre, but the list.rating, well that is always going to give some problem here (I just learnt PIG along with hive, so grouping works differently there)
So to tackle the problem, I casted the rating and averaged it out and stored it in the float table. Have a look at my code below:
CREATE TABLE movies.movierating(id STRING, name STRING, genre STRING, rating FLOAT);
INSERT OVERWRITE TABLE movies.movierating
SELECT list.id, list.name, list.genre, AVG(cast(rating.rating as FLOAT)) from movies.list list LEFT JOIN movies.rating rating ON (list.id=rating.id) GROUP BY list.id, list.name,list.genre order by list.id DESC;
Thank you for your explanation. I might save the following question for the next thread but here is my observation:
The performance of the Overall job is reduced when performing Grouping and Joining together than to do it in two separate queries. For the same job, I had changed the code a bit to perform the grouping first and then joining the data and the over all time was reduced by 40 seconds. Earlier it was taking 140 seconds and now it is taking 100 seconds. Any reasons to that?
Once again thank you for your explanation.
I came across same issue:
org.apache.hadoop.hive.ql.parse.SemanticException: Invalid column reference "charge_province"
After I put the "charge_province" in the group by, the issue is gone. I don't know why.
Hi ,
I am new to crystal report. I have a problem to create formula :
Let's say :
I have two tables :
tbl_Details :
Emp_id Emp_nameEmp_Deptt
1 Ram MMM
2 Naresh NNN
3 kapil HHH
4 Namita DDD
tbl_Mapping :
Type1 Type2 Emp_Deptt
ButterSotch ButterScotch NNN
ButterScotch Strawberry DDD
Olive Starch MMM
Olive Olive HHH
Note : In the above tables, Emp_Deptt column is same.
Now i want to create a formula like as below :
if Mapping.Type1 = Mapping.Type2 then find Emp_Deptt in Details table and get the Emp_name.
for example :
Butterscotch = Butterscotch then Emp_Deptt is NNN matched with Details table and the Emp_name is Naresh.
if doesn't find any match then nothing to do.
Now, i want to create a formula to get the desired value and print place somewhere in crystal report.
From Database Menu select 'Database Expert'. Add tbl_Mapping & tbl_Details to the selected tables.. make sure tbl_Mapping & tbl_Details are linked with Emp_Deptt fields.
Write following in the formula editor:
if {tbl_Mapping.Type1} = {tbl_Mapping.Type2} then {tbl_Details.Emp_name}
Let's say I have table data similar to the following:
123456 John Doe 1 Green 2001
234567 Jane Doe 1 Yellow 2001
234567 Jane Doe 2 Red 2001
345678 Jim Doe 1 Red 2001
What I am attempting to do is only isolate the records for Jane Doe based upon the fact that she has more than one row in this table. (More that one sequence number)
I cannot isolate based upon ID, names, colors, years, etc...
The number 1 in the sequence tells me that is the first record and I need to be able to display that record, as well as the number 2 record -- The change record.
If the table is called users, and the fields called ID, fname, lname, seq_no, color, date. How would I write the code to select only records that have more than one row in this table? For Example:
I want the query to display this only based upon the existence of the multiple rows:
234567 Jane Doe 1 Yellow 2001
234567 Jane Doe 2 Red 2001
In PL/SQL
First, to find the IDs for records with multiple rows you would use:
SELECT ID FROM table GROUP BY ID HAVING COUNT(*) > 1
So you could get all the records for all those people with
SELECT * FROM table WHERE ID IN (SELECT ID FROM table GROUP BY ID HAVING COUNT(*) > 1)
If you know that the second sequence ID will always be "2" and that the "2" record will never be deleted, you might find something like:
SELECT * FROM table WHERE ID IN (SELECT ID FROM table WHERE SequenceID = 2)
to be faster, but you better be sure the requirements are guaranteed to be met in your database (and you would want a compound index on (SequenceID, ID)).
Try something like the following. It's a single tablescan, as opposed to 2 like the others.
SELECT * FROM (
SELECT t1.*, COUNT(name) OVER (PARTITION BY name) mycount FROM TABLE t1
)
WHERE mycount >1;
INNER JOIN
JOIN:
SELECT u1.ID, u1.fname, u1.lname, u1.seq_no, u1.color, u1.date
FROM users u1 JOIN users u2 ON (u1.ID = u2.ID and u2.seq_no = 2)
WHERE:
SELECT u1.ID, u1.fname, u1.lname, u1.seq_no, u1.color, u1.date
FROM users u1, thetable u2
WHERE
u1.ID = u2.ID AND
u2.seq_no = 2
Check out the HAVING clause for a summary query. You can specify stuff like
HAVING COUNT(*) >= 2
and so forth.