This query has found 220 duplicate values. It’s the same as Example 1. Now, let’s run it as a DELETE query. DELETEFROMcustomeraWHEREa.rowid>ANY(SELECTb.rowidFROMcustomerbWHEREa.first_name=b.first_nameANDa.last_name=b.last_nameANDa.address=b.address); The result is: 220 rows delet...
SELECT DISTINCT * INTO duplicate_table FROM original_table GROUP BY key_value HAVING COUNT(key_value) > 1 DELETE original_table WHERE key_value IN (SELECT key_value FROM duplicate_table) INSERT original_table SELECT * FROM duplicate_table DROP TABLE duplicate_table 此脚本按给定...
2. Only primary key or unique key value is different, but remaining all values are same. Scenario 1: Delete duplicate rows without primary key or unique key. Let us create the following example. create table customers1 (CustId Int, CustName Varchar(20), CustCity Varchar(20), Passport_Numbe...
. To ensure that only 10 rows are deleted, the column specified in the subselect statement (PurchaseOrderID) is the primary key of the table. Using a nonkey column in the subselect statement may result in the deletion of more than 10 rows if the specified column contains duplicate values....
VALUES (1,'A',34), (1,'A',34), (2,'B',37), (3,'C',21), (3,'C',21), (3,'C',21); GO SELECT id,name,age FROM Test; -- Now delete the duplicate records WITH CTE(id,name,age,Duplicates) AS ( SELECT id,name,age, ...
. To ensure that only 10 rows are deleted, the column specified in the subselect statement (PurchaseOrderID) is the primary key of the table. Using a nonkey column in the subselect statement may result in the deletion of more than 10 rows if the specified column contains duplicate values....
-- removing duplicate using copy, delete and copy select distinct name into #unique from #programming delete from #programming; insert into #programming select * from #unique -- check after select * from #programming name Java C++ JavaScript ...
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INSERT TUser VALUES ('Tom','German', 'test5') 3.筛选数据 SELECT RN=ROW_NUMBER() OVER (ORDER BY name) FROM TUser where Name='Tom' 4.概要-删除表中重复的行 TUser表中有3条重复的数据,我们现在希望删掉前2条,保留第3条 WITH [CTE DUPLICATE] as ...
例如 INSERT INTO teacher (id,name) VALUES (1,'a'), (NULL,'b'), (5,'c'), (NULL,'d'); 只是指定了部分id的值。另一种类型的“混合模式插入”是 INSERT ... ON DUPLICATE KEY UPDATE 。 1. 2. 3. 4. 5. 6. 7. 8. 9.#innodb_autoinc_lock_mode有三种取值,分别对应与不同锁定模式:...