delete adjacent duplicates from l_it_sturcture comparing name. 解释: (1) sort <table> by <field> 功能:按照给定字段对内表排序 (2) delete adjacent duplicates from <table> comparing <field> 功能:删除数据后面,与他临近的指定相同自动的数据记录。
from table_name [where ...] [order by ...] limit s, n; 从s 开始,筛选 n 条结果,比第二种用法更明确 select ... from table_name [where ...] [order by ...] limit n offset s; 对未知表进行查询时,最好加一条 limit 1,避免因为表中数据过大,查询全表数据导致数据库卡死。
获取数据内容 select * from ZWDEMOTABLE1 into CORRESPONDING FIELDS OF TABLE gt_Data . 1. 如图我们有一列是具有相同数据的列数据,其中双为多次内容. 使用语法 sort gt_Data by uom doccode zrowid matcode matname memo . DELETE ADJACENT DUPLICATES FROM gt_Data COMPARING uom . 1. 2. 3. 我们按照...
try_single_table_update(this=0x7fdcec006808, thd=0x7fdcec000bc0, switch_to_multitable=0x7fe0c81c9cff) at /home/Code/GitHub/stonedb/sql/sql_update.cc:2927#4 0x00000000024853d7 in Sql_cmd_update::execute(this=0x7fdcec006808, thd=0x7fdcec000bc0) at /home/Code/GitHub/stonedb...
2 a join customers2 b on a.custid <> b.custid and a.CustName = b.CustName and a.CustCity = b.CustCity and a.Passport_Number = b.Passport_Number ) Delete from Customers2 where custid in (select Customer_ID from Duplicates) and custid <> (select min(Customer_ID) from Duplicates)...
obclient> CREATE TABLE tbl1(col1 INT PRIMARY KEY, col2 INT); Query OK, 0 rows affected obclient> INSERT INTO tbl1 VALUES(1,1),(2,2),(3,3),(4,4); Query OK, 4 rows affected Records: 4 Duplicates: 0 Warnings: 0 obclient> SELECT * FROM tbl1; +---+---+ | COL1 | COL...
If we look at the result set, we can easily understand thatBookNumber: 3andBookNumber: 4are duplicate rows. Previously, it was explained in detailhow to remove duplicates in SQL. We must delete them to keep the database consistent.
How to Delete Duplicate Records in Sql Server, removing duplicates using cte, delete duplicate rows from a table in sql SERVER using a CTE.
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DELETE FROM ( SELECT id, ROW_NUMBER() OVER (PARTITION BY name, age ORDER BY id) AS row_num FROM students ) AS duplicates WHERE row_num > 1; 在这个例子中,使用`ROW_NUMBER()`函数为重复的记录分配行号,然后删除行号大于1的记录。 综上所述,DELETE语句是SQL中常用的命令之一,用于删除数据库中的...