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MySQL join multiple lines


MySQL join multiple lines

By : user2953189
Date : November 20 2020, 01:01 AM
With these it helps I have database with 2 tables, 1 for storing customers Id and for customer informations. The second table is ordered with key/value because I need to store undefined values. , Try this:
code :
SELECT ci.id_customer AS CustomerId, ci.value AS CustomerName
FROM customers_info ci 
WHERE ci.key = 'name'
ORDER BY ci.id_customer;
| CUSTOMERID | CUSTOMERNAME |
|------------|--------------|
|          1 |          Doe |
|          2 |        Smith |
SELECT ci.id_customer AS CustomerId, 
       MAX(CASE WHEN ci.key = 'name' THEN ci.value ELSE '' END) AS CustomerName, 
       MAX(CASE WHEN ci.key = 'age' THEN ci.value ELSE '' END) AS CustomerAge, 
       MAX(CASE WHEN ci.key = 'city' THEN ci.value ELSE '' END) AS CustomerCity
FROM customers_info ci 
GROUP BY ci.id_customer
ORDER BY ci.id_customer;
| CUSTOMERID | CUSTOMERNAME | CUSTOMERAGE | CUSTOMERCITY |
|------------|--------------|-------------|--------------|
|          1 |          Doe |          25 |           NY |
|          2 |        Smith |             |              |
SELECT a.CustomerId, a.CustomerName, a.CustomerAge, a.CustomerCity, g.name AS CustomerGender
FROM (SELECT ci.id_customer AS CustomerId, 
             MAX(CASE WHEN ci.key = 'name' THEN ci.value ELSE '' END) AS CustomerName, 
             MAX(CASE WHEN ci.key = 'age' THEN ci.value ELSE '' END) AS CustomerAge, 
             MAX(CASE WHEN ci.key = 'city' THEN ci.value ELSE '' END) AS CustomerCity
      FROM customers_info ci 
      GROUP BY ci.id_customer
     ) AS a
INNER JOIN customers c ON a.CustomerId = c.id 
LEFT OUTER JOIN gender g ON C.genderId = c.id 
ORDER BY a.CustomerId;


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awk join multiple lines

awk join multiple lines


By : user3662995
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I want to join lines between opening tag and closing tag with class named "content_subhd", For example:
code :
awk '/<span class="content_subhd">/, /<\/span>/ {
  r = r ? r $0 : $0
  if (/<\/span>/) {
    print r; r = x
    }
  next
  }1' infile
awk > _new_ '/<span class="content_subhd">/, /<\/span>/ {
  r = r ? r $0 : $0
  if (/<\/span>/) {
    print r; r = x
    }
  next
  }1' your_file && 
    mv -- _new_ your_file 
find <your arguments here> | 
  while IFS= read -r; do
    awk > _new_ '/<span class="content_subhd">/, /<\/span>/ {
  r = r ? r $0 : $0
  if (/<\/span>/) {
    print r; r = x
    }
  next
  }1' "$REPLY" && 
    mv -- _new_ "$REPLY" 
  done
Inner Join: Mysql prints more lines than available (same multiple rows)

Inner Join: Mysql prints more lines than available (same multiple rows)


By : Navdeep
Date : March 29 2020, 07:55 AM
like below fixes the issue I have to tables (hmmscan1 and arath_scan), which I want to join. They both display the same column names and arath_scan is a smaller table which is included in hmmscan1. Now I want to select only those entries of hmmscan1 where a certain column (domain_name) of hmmscan1 and arath_scan agree. , you need a group by .try this
code :
    select h.auto_inc,h.query_prot_id,h.taxon_schema, h.domain_name 
    from hmmscan1 as h 
    inner join arath_scan on h.domain_name=arath_scan.domain_name
    GROUP BY h.domain_name;
Full Outer Join (left join union right join) MySQL multiple tables

Full Outer Join (left join union right join) MySQL multiple tables


By : user3793895
Date : March 29 2020, 07:55 AM
around this issue Just have a look at Below query, Hope this may help you! Later you can Modify Accordingly
This will join to all 5 tables. Here I kept Location as the Left Table so that All locations will be Displaying after firing this query and matching Id's will be matched to this table.
code :
SELECT * FROM location LEFT JOIN location_type ON location_type.type_id=location.loc_id
    LEFT JOIN hours ON location.loc_id=hours.loc_id 
    LEFT JOIN holiday ON holiday.loc_id=location.loc_id 
    LEFT JOIN holiday_hours ON holiday.hol_id=holiday_hours.holiday_id
mysql join count lines in third table

mysql join count lines in third table


By : Miraj
Date : March 29 2020, 07:55 AM
it should still fix some issue I have three mySQL-tables like this:
code :
SELECT c.*, n.name, COUNT(a.id) number_of_activities_for_each_client
FROM clients c
LEFT JOIN network n
ON n.id = c.network_id
LEFT JOIN activities a
ON a.client_id = c.id
GROUP BY c.id
SQL count(*) issues with join on multiple tables in mysql involving an outer join

SQL count(*) issues with join on multiple tables in mysql involving an outer join


By : ozan cin
Date : March 29 2020, 07:55 AM
it fixes the issue I have three tables, lets say t1, t2, t3 with columns as , Try this query:
code :
SELECT t2.c4, t1.c2, COUNT(t3.c6) 
FROM t1
INNER JOIN t2 ON t1.c1 = t2.c1
LEFT JOIN t3 ON t3.c4 = t2.c4
WHERE t2.c5 = '11'
GROUP BY t2.c4, t1.c2
c4  c2  count
-------------
1   11111   2
2   11111   0
3   22222   0
SELECT t2.c4, t1.c2, COUNT(t3.c6) as count
FROM t1
INNER JOIN t2 ON t1.c1 = t2.c1
LEFT JOIN t3 ON t3.c4 = t2.c4
WHERE t2.c5 = '12'
GROUP BY t2.c4, t1.c2
c4  c2      count
-----------------
4   22222   0
5   33333   1
6   22222   0
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