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[英]MYSQL Join - Parent and Child table join and get only the latest record from the child table
[英]Get parent name in child record in IN() from same table in Mysql
我有這樣的桌子
tax_id tax_name parent_tax_id
1 Sales Tax 0
2 Lodging Tax 0
3. Resort Tax 1
4. Hospitality Tax 2
Select tax_name, tax_id from taxes WHERE tax_id IN (3,4).
上面的查詢將為我提供ID為3和4的兩行,我需要在同一行中獲取其父項的tax_name:
SELECT tax_name, tax_id,
(SELECT tax_name FROM taxes ....) as parent_tax_name
from taxes WHERE tax_id IN (3,4)
而且我只需要使用IN(),請讓我知道完成此操作的方法。
提前致謝
與自己一起使用聯接。 左加入,因為並非每一行似乎都有一個父級
SELECT
taxes.tax_name,
taxes.tax_id,
parent.tax_name AS parent_tax_name
FROM
taxes LEFT JOIN taxes AS parent ON taxes.parent_tax_id = parent.tax_id
WHERE
taxes.tax_id IN (3,4)
您可以使用如下所示的聯接查詢,
Select t.tax_name, t.tax_id, tt.tax_name as parent_tax from taxes as t left join taxes as tt on (t.parent_tax_id = tt.tax_id) WHERE t.tax_id IN (3,4)
parent_tax將是父行的tax_name
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