`idx_age_name` (`age`,`name`) ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 1 row in set (0.00 sec) mysql> insert into t_index(age, name) values(8, "Tom"),(8, "David"), (10, "Andy"); Query OK, 3 rows affected (0.00 sec) Records: 3 Duplicates: 0 Warnings: 0 ...
Query OK, 0 rows affected (0.41 sec) Records: 0 Duplicates: 0 Warnings: 0#然后再次执行sp,就会发现这次执行了这句SQL的prepare再进行execute。 MySQL> call p1; Query OK, 0 rows affected (34.24 sec) 二、代码跟踪现在跟踪一下这个sp看看上面在哪里check表版本并且能正确执行reprepare的。#...
The only change in the sub query will be that we need to use min(CustomerID) instead of max(CustomerID). So the query will be as follows. With Duplicates as (select distinct a.custid as Customer_ID from customers2 a join customers2 b on a.custid <> b.custid and a.CustName = b....
The WHERE clause of the outer query uses a > ANY condition to check for duplicates. It will delete any row that has a rowid greater than at least one other row. This ensures that all but one of the rows that match your conditions is met, therefore removing all duplicates. So, how doe...
//创建数据库//语法:create database [if not exists] 'da_name';//创建数据库zslmysql>create database zsl;QueryOK,1rowaffected(0.00sec)//查看当前实例有哪些数据库mysql>show databases;+---+|Database|+---+|information_schema||mysql||performance_schema||sys||zsl|+---+5rowsinset(0.00sec...
For more information, see Linked Servers (Database Engine). The OPENROWSET function can be referenced in the FROM clause of a query as if it were a table name. The OPENROWSET function can also be referenced as the target table of an INSERT, UPDATE, or DELETE statement, subject to the ...
Add query string when user clicks back button Add Reference Issue Add rows to a Table in run time , one by one Add Trusted Site in the IIS server Adding .ASHX files to an existing Project... Adding a asp:button in Literal control. Adding a hyperlink text in the email message body in...
Alternative to Row_Number Query Alternative way STUFF for XML PATH ('') ? Am getting an error when i run this code Ambiguous Column Name An aggregate may not appear in the set list of an UPDATE statement... An error occurred while executing batch. Error message is: Error creating window...
(42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'where avg(sal)<2000' at line 1// succeed:分组后的数据只能用having字句进行筛选mysql> select avg(sal), deptno from emp group by deptno having...
OPENROWSETalways imports a data file as a single batch. However, if you specifyrows_per_batchwith a value > 0, the query processor uses the value ofrows_per_batchas a hint for allocating resources in the query plan. By default,ROWS_PER_BATCHis unknown. SpecifyingROWS_PER_BATCH = 0is th...