SQL 列合并条件且不重复

Question

Trying to combine 2 tables into 1 results table without having duplicate entries.
Conditions are:
1. For each t1name look for each days in t2date, and if there is 1 in t2update, use that info. If there is no 1, then use the 0 row.
2. If the t1name doesn't exist in t2name, create it with the t1date, and set t2update as 0.

Here the are tables examples:

| t1name | t1date     | t1department |
| ------ | ---------- | ------------ |
| name 1 | 2000.01.01 | tlc          | 
| name 1 | 2000.01.01 | tlc          |
| name 2 | 2000.01.04 | non-tlc      |
| name 3 | 2000.01.04 | non-tlc      |
| name 4 | 2000.01.04 | tlc          |
| name 5 | 2000.01.04 | tlc          |
| name 6 | 2000.01.04 | tlc          |
| name 7 | 2000.01.04 | tlc          |  

Table 1

| t2name | t2update | t2date       |
| ------ | -------- | ------------ |
| name 1 | 1        | 2000.01.01   |
| name 1 | 0        | 2000.01.02   | 
| name 1 | 1        | 2000.01.02   | 
| name 2 | 1        | 2000.01.04   | 
| name 2 | 0        | 2000.01.04   | 
| name 2 | 0        | 2000.01.09   | 
| name 3 | 0        | 2000.01.09   | 
| name 3 | 1        | 2000.01.05   | 
| name 4 | 0        | 2000.01.03   |

Table 2

| rname  | rupdate | rdate        |
| ------ | ------- | ------------ |
| name 1 | 1       | 2000.01.01   |
| name 1 | 1       | 2000.01.02   | 
| name 2 | 1       | 2000.01.04   | 
| name 3 | 0       | 2000.01.02   | 
| name 3 | 1       | 2000.01.05   | 
| name 4 | 0       | 2000.01.03   | 
| name 5 | 0       | 2000.01.09   | 
| name 6 | 0       | 2000.01.09   | 
| name 7 | 0       | 2000.01.09   | 

Results table

Currently using following:

CREATE OR REPLACE VIEW "rtable" AS 
(
   SELECT DISTINCT
      ((CASE WHEN (t2.t2updates) > 0) AND (MAX(t1.t1date))) THEN name
    , t1.date
    , t1.t1department
    , t2.updates 
FROM (table1 t1
LEFT JOIN table2 t2 on (t2.t2name = t1.t1name))
GROUP BY 
    , t1.date
    , t1.t1department
    , t2.updates
ORDER BY t1.t1name ASC
)

And the results return duplicate values per day. For single t1name and t1date have both entries for 1 and 0. Need the outcome in a specific way so it I can do KPI on the updates of the VMs.

Answer 1

After simplifying the approach, and plenty of trials and error, simple right join did the job

CREATE OR REPLACE VIEW "rtable" AS 
(
   SELECT
      t2.name
    , t2.date
    , t1.t1department
    , t2.updates 
FROM 
    (table1 t1
Right JOIN table2 t2 on (t2.t2name = t1.t1name) AND (t2.date = t1.date)))
)