代码语言:sql AI代码解释 SELECT * FROM Customers FETCH FIRST 3 ROWS ONLY; 使用旧版 Oracle 的 ROWNUM 以下SQL 语句展示了旧版 Oracle 的等效示例: 选择"Customers" 表的前 3 条记录: 代码语言:sql AI代码解释 SELECT * FROM Customers WHERE ROWNUM <= 3;
SELECTTOP3*FROMCustomers WHERECountry='Germany'; 以下SQL 语句展示了 MySQL 的等效示例: SELECT*FROMCustomers WHERECountry='Germany' LIMIT3; 以下SQL 语句展示了 Oracle 的等效示例: SELECT*FROMCustomers WHERECountry='Germany' FETCHFIRST3ROWSONLY; 添加ORDER BY 关键字 在要对结果进行排序并返回排序后结果的...
and table names and -- set their default values DECLARE Source CHARACTER 'Production'; DECLARE Schema CHARACTER 'db2admin'; DECLARE Table CHARACTER 'DynamicTable1'; -- Code which calculates their actual values comes here -- Delete rows from the table DELETE FROM Database.{Source}.{Schema}.{...
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DELETE FROMtable-nameWHEREsearch-condition ... 例如,假定部门 D11 已移至另一个站点。 删除 WORKDEPT 值为 D11 的 CORPDATA.EMPLOYEE 表中的每行,如下所示: DELETE FROMCORPDATA.EMPLOYEEWHEREWORKDEPT = 'D11'; WHERE 子句告诉 SQL 要从表中删除哪些行。 SQL 从基本表中删除满足搜索条件的所有行。 从...
SQL DELETESales.ShoppingCartItemOUTPUTDELETED.*WHEREShoppingCartID =20621;--Verify the rows in the table matching the WHERE clause have been deleted.SELECTCOUNT(*)AS[RowsinTable]FROMSales.ShoppingCartItemWHEREShoppingCartID =20621; GO J. 在 DELETE 语句中同时使用 OUTPUT 与 <from_table_name> ...
-- 开始一个事务BEGINTRANSACTION;-- 假设执行了误删除操作DELETEFROMemployeesWHEREid=1;-- 查看日志中的操作记录SELECT*FROMfn_dblog(NULL,NULL)WHEREOperation='LOP_DELETE_ROWS';-- 如果确认要撤销,则可以进行回滚ROLLBACKTRANSACTION; 1. 2. 3.
runoobdb# select * from COMPANY;id|name|age|address|salary---+---+---+---+---1|Paul|32|California|200002|Allen|25|Texas|150003|Teddy|23|Norway|200004|Mark|25|Rich-Mond|650005|David|27|Texas|850006|Kim|22|South-Hall|450007|James|24|Houston|10000(7rows) 以下SQL 语句将删除 ID 为 ...
SELECT ROW_COUNT( as rows_deleted; ``` 在这个例子中,我们首先执行了DELETE FROM语句删除满足指定条件的数据行,然后使用SELECT语句查询受影响的行数,并将其命名为rows_deleted。 需要注意的是,使用DELETEFROM语句要谨慎。删除操作是不可逆的,一旦删除数据,将无法恢复。因此,在执行DELETEFROM语句之前,应该仔细检查条...
UPDATE pay_stream a SET a.return_amount = 0 WHERE a.pay_id IN (SELECT b.pay_id FROM pay_main b WHERE b.user_name = '1388888888'); id select_type table partitions type possible_keys key key_len ref rows filtered Extra --- --- --- --- --- --- --- --- --- --- --...