SELECT column_name(s) FROM table_name ORDER BY column_name(s) FETCH FIRST number ROWS ONLY; 旧版Oracle 语法: 代码语言:sql AI代码解释 SELECT column_name(s) FROM table_name WHERE ROWNUM <= number; 带有ORDER BY 的旧版 Oracle 语法: 代码语言:sql AI代码解释 SELECT * FROM (SELECT column_na...
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...
SELECTcolumn_name(s)FROMtable_nameWHEREconditionLIMIT number; Oracle 12 语法: SELECTcolumn_name(s)FROMtable_nameORDERBYcolumn_name(s)FETCHFIRSTnumberROWSONLY; 旧版Oracle 语法: SELECTcolumn_name(s)FROMtable_nameWHEREROWNUM<=number; 带有ORDER BY 的旧版 Oracle 语法: SELECT*FROM(SELECTcolumn_name(s...
http://dev.mysql.com/doc/refman/8.0/en/with.html.Single-TableSyntaxDELETE[LOW_PRIORITY][QUICK][IGNORE]FROMtbl_name[PARTITION (partition_name [, partition_name]...)][WHERE where_condition][ORDER BY ...][LIMIT row_count]TheDELETEstatement deletes rowsfromtbl_nameandreturnsthenumberofdeleted r...
DELETE FROM table_name; The following SQL statement deletes all rows in the "Customers" table, without deleting the table:Example DELETE FROM Customers; Delete a TableTo delete the table completely, use the DROP TABLE statement:Example Remove the Customers table: DROP TABLE Customers; ...
(NULL) DELETE a FROM pay_stream a INNER JOIN pay_main b ON a.pay_id = b.pay_id WHERE b.user_name = '1388888888'; id select_type table partitions type possible_keys key key_len ref rows filtered Extra --- --- --- --- --- --- --- --- --- --- --- --- 1 SIMPLE ...
开始我们拿sql到数据库查询平台查库执行计划,无奈这个平台有bug,delete语句无法查看,所以我们改成select,“应该”是一样。这个“应该”加了双引号,导致我们走了一点弯路。EXPLAIN SELECT * from t_table_1 where task_id in (select id from t_table_2 where uid = 1) explain后可以看到是走了索引的 到这里...
hive 表不支持针对某条数据的删除: DELETE FROM dim.dimension_cate_potential_have_set WHERE item_second_cate_cd = '16755' 行不通 解决方案: 创建临时表(不包含要删除的数据) create table xxx as select * from dim.dimension_cate_potential_have_set WHERE item_second_cate_cd <> '16755'; ...
19 rows selected. SQL> explain plan for delete from (select * from t1,t2 where t1.id=1 and t2.id=t1.id and t2.info='digoal'); Explained. SQL> select * from table(dbms_xplan.display); PLAN_TABLE_OUTPUT --- Plan hash value: 2064908203 ---...