WebJul 9, 2015 · DELETE FROM TABLE WHERE jobPositonId = (SELECT x.id FROM (SELECT MAX (t.jobPostionId) AS id FROM TABLE t) x) Explanation MySQL is only checking, when using UPDATE & DELETE statements, if the there's a first level subquery to the same table that is being updated. That's why putting it in a second level (or deeper) … WebSep 19, 2024 · The Problem – Removing Duplicates in SQL Summary of Methods Method 1 – ROW_NUMBER Analytic Function Method 2: Delete with JOIN Method 3 – MIN or MAX Function Method 4 – DENSE_RANK Method 5 – Correlated Subquery with MIN or MAX Method 6: Use a Subquery with ANY Other Methods You Might Come Across Method 7: …
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WebWHERE clause The DELETE statement deletes all the rows that satisfy the conditions in the WHERE clause. all rows from the named table are deleted. If a second FROM clause is present, the WHERE clause qualifies the rows of the … WebOct 9, 2015 · delete from mytable where id in (select id from mytable where someconditon) or you can try like this if you want to delete top 10 using ctid: DELETE FROM mytable WHERE ctid IN ( SELECT ctid FROM mytable GROUP BY s.serialId, s.valuetimestamp ORDER BY s.serialId LIMIT 10 ) If you are looking to remove the duplicates from your … cheddars lane cambridge
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WebSELECT (sub)queries return result sets.So you need to use IN, not = in your WHERE clause.. Additionally, as shown in this answer you cannot modify the same table from a subquery within the same query. However, you can either SELECT then DELETE in separate queries, or nest another subquery and alias the inner subquery result (looks … WebSep 22, 2016 · DELETE FROM myTable WHERE columnA IN (SELECT MAX (columnA) as columnA FROM myTable GROUP BY -- the 50 other columns above HAVING count (*) > 1 ); This assumes that columnA is globally unique in the table. Otherwise, you will have to work a bit harder. WebApr 12, 2024 · 2.3. Demo sử dụng Explain SQL với câu lệnh Delete; 2.4. Demo sử dụng Explain SQL với câu lệnh Insert; 3. Xem chi tiết hơn với Explain Analyze; 4. Nếu bạn … cheddars lafayette ind