Solution 2: Add primry key in your table then you can easily remove duplicates from your table using below query: DELETEFROMmemberWHEREidIN(SELECT*FROM(SELECTidFROMmemberGROUPBYmember_id, quiz_num, question_num, answer_numHAVING(COUNT(*)>1) )ASA ); Solution 3: SELECTDISTINCT*INTOTableA_Ver...
你也可以通过安装向导程序(下载的mysql-installer-community.msi文件)进行MySQL8.0服务器程序的卸载。按照提示操作即可,在卸载过程中,想要同时删除MySQL服务器中的数据,则勾选“Remove the data directory”,想要同时卸载MySQL8.0的安装向导程序,勾选“Yes,Uninstall MySQL Installer” 即可。 步骤3:残余文件的清理 对残余...
8 Query OK, 0 rows affected (0.01 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> show create tablestudent\G *** 1. row *** Table: student Create Table: CREATE TABLE \`student\` ( `id` int(11)NOT NULL, `name` varchar(20) CHARACTER SET latin1 DEFAULT NULL, \#字段仍然是...
Query OK, 6 rows affected (0.13 sec) Records: 6 Duplicates: 3 Warnings: 0 You see the above output shows “Records: 6 Duplicates: 3” which means there were six records and 3 duplicate records were removed. Check again duplicate records were actually removed mysql> select * from test; +...
SELECT * from t_table_1 where task_id in (select id from t_table_2 where uid = 1) SELECT * FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE; 1. 2. 3. 4. 输出结果比较长,这里我只挑选主要信息 AI检测代码解析 "steps": [ { "expanded_query": "/* select#2 */ select `t_table_2`.`id` fr...
Reading from net The server is reading a packet from the network. Removing duplicates The query was using SELECT DISTINCT in such a way that MySQL could not optimize away the distinct operation at an early stage. Because of this, MySQL requires an extra stage to remove all duplicated rows be...
c,pad from sbtest1; Query OK, 2000000 rows affected (38.25 sec) Records: 2000000 Duplicates:...
Query OK, 3 rows affected (0.05 sec) Records: 3 Duplicates: 0 Warnings: 0 # 基于上面的新表结构和数据再创建一个表 [cce]>create table new_cce select * from cce; Query OK, 3 rows affected (0.73 sec) Records: 3 Duplicates: 0 Warnings: 0 ...
不支持query_expression_options,如:HIGH_PRIORITY/STRAIGHT_JOIN/SQL_SMALL_RESULT/SQL_BIG_RESULT/SQL_BUFFER_RESULT/SQL_CACHE/SQL_NO_CACHE/SQL_CALC_FOUND_ROWS 不支持不带列名的INSERT/REPLACE 不支持全局的DELETE/UPDATE使用ORDER BY/LIMIT(版本>=14.4支持) 不支持不带WHERE条件的UPDATE/DELETE 不支持LOAD DAT...
allow_duplicates : dict_index_t, row_prebuilt_tallow_failure_at_next_query() : collector::CountedMySQLSessionallow_filtering : mrs::database::entry::ObjectFieldallow_group_via_temp_table : Item_sum, Temp_table_paramallow_impl() : mrs::authentication::RateControlFor< ControlType, measure_...