针对你提出的“table 'tb_user' already exists”问题,以下是详细的分析和解决方案: 一、确认错误信息 错误信息“table 'tb_user' already exists”指的是在尝试创建名为'tb_user'的数据库表时,该表已存在于数据库中。这通常发生在执行CREATE TABLE语句时,如果同名表已存在,数据库会抛出此错误。 二、分析可能...
CREATE [TEMPORARY]TABLE [IFNOT EXISTS] tbl_name {LIKE old_tbl_name | (LIKE old_tbl_name) } 示例 mysql>createtable tb2like book; Query OK, 0rows affected (0.10 sec) 存在同名表时: mysql>createtable tb1(idint(10),tint(3)); ERROR 1050 (42S01):Table'tb1' already exists mysql>creat...
全量阶段失败报错,关键词“Table *** already exists” already exists。 可能原因 目标库已经存在此无主键表。 解决方案 联系客户运维工程师将目标库表中的无主键表删除。 修改完成后,在任务列表中,单击任务对应操作列的“续传”,重新提交任务。 父主题: MySQL->MySQL实时迁移和同步 来自:帮助中心 查看更多 ...
create table if not exists test ( a bigint auto_increment primary key, name varchar(128) charset utf8, key name (name(32)) ) engine=InnoDB default charset latin1; This example shows a couple of things: Usage of IF NOT EXISTS; If the table already existed, it will not be created....
assert(!db->find_table("Table_X"));// The followingcreate_table() must fail because "Table_1" already exists.try{ db->create_table("Table_1"); assert(false); }catch(...) { }// Create tables named "Table_2" and "Table_3".assert(db->create_table("Table_2")); ...
{cn.peter.gasread/cn.peter.gasread.DBTestActivity}: android.database.sqlite.SQLiteException: table TB_READ_PERIOD already exists: ,whilecompiling: CREATE TABLE TB_READ_PERIOD(_id INTEGER PRIMARY KEY,READ_BOOK_ID TEXT,READ_BOOK_NAME TEXT,READER_ID TEXT,READER_NAME TEXT,STATION_ID TEXT,STATION...
select sum(a) from tb1 where a > 100 and a < 200; Bitmap Equivalent query columns are specified to constitute a bitmap index. select * from tb1 where a =100; Event time column (segment key) Columns that are strongly correlated with time, such as log and traffic columns, are speci...
-- Create a new table named 'newauthor' if it does not already exist CREATE TABLE IF NOT EXISTS newauthor( -- Define a column named 'aut_id' with a data type of VARCHAR(8) aut_id varchar(8), -- Define a column named 'aut_name' with a data type of VARCHAR(50) ...
特别强调,MySQL5.7和8.0中对这两个关键字有不同的优化,所以我要分开两个版本来讨论。 数据准备 我准备了一张tb_class表和一张tb_stu表 注:600个班级,12万个学生。tb_stu是大表,tb_class是小表。为了避免索引优化带来的影响... sql中的exists/not exists/in/not in的用法及区别...
CALLISPLINK('TBCREATE',table-name,key-name-list'b',name-list'b','WRITEbbb''b''NOWRITEb','REPLACEb''b',library'b','SHAREbbb''b'); Return codes 0 Normal completion. 4 Normal completion—a duplicate table exists but REPLACE was specified. 8 Either the table already exists and REPLACE...