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You can use a case statement if you know all of the columns you will be getting, as follows: Select distinct table_1.*, case when table_2.key='desc' then value end as desc, case when table_2.key='begin_day' then value end as begin_day, case when table_2.key='end_day' then value end as end_day FROM table_1 LEFT JOIN table_2 on table_1.id = table ...
1 sty 2018 · Just use LEFT JOIN + DATE_FORMAT: SELECT t2.Day, t1.Month, t1.Value1, t2.Value2 FROM Table2 t2 LEFT JOIN Table1 t1 ON DATE_FORMAT(t2.Day, '%Y-%m-01') = t1.Month http://www.sqlfiddle.com/#!9/920c79/1
2 dni temu · B, C and D are tables containing this ID and Dates and other infos. I have to create a list : A.ID, A.info, a DATE existing in B, C OR D and the other infos from B, C and D. Example: Table A ID_A infoA and other 1 Tom Table B date ID_A infoB and other 20241001 1 20 20241005 1 30 20241006 1 40 Table C date ID_A infoC and other 20241001 1 x ...
18 wrz 1996 · Supported Types of Joins in MySQL. INNER JOIN: Returns records that have matching values in both tables; LEFT JOIN: Returns all records from the left table, and the matched records from the right table; RIGHT JOIN: Returns all records from the right table, and the matched records from the left table; CROSS JOIN: Returns all records from both tables
A join is a method of linking data between one or more tables based on the values of the common column between the tables. MySQL supports the following types of joins: Inner join; Left join; Right join; Cross join; To join tables, you use the cross join, inner join, left join, or right join clause.
6 lip 2017 · Using the JOIN Predicate. Let's get the number of users under 30 in each city. We will use LEFT JOIN to retrieve cities without any user records: SELECT cityname, COUNT(users.id) FROM cities LEFT JOIN users ON cities.id = users.city_id AND users.age < 30 GROUP BY cities.cityname ORDER BY cities.cityname;
The following statement illustrates how to join two tables t1 and t2 using the INNER JOIN clause: SELECT select_list FROM t1 INNER JOIN t2 ON join_condition; Code language: SQL (Structured Query Language) (sql) The INNER JOIN clause compares each row in the t1 table with every row in the t2 table based on the join condition.
