DELIMITER//CREATEPROCEDUREcopy_table_structure(INsource_table_nameVARCHAR(100),INnew_table_nameVARCHAR(100))BEGIN-- 获取源表结构SET@sql=CONCAT('SHOW CREATE TABLE ',source_table_name,';');PREPAREstmtFROM@sql;EXECUTEstmt;DEALLOCATEPREPAREstmt;-- 创建新表SET@sql=CONCAT('CREATE TABLE ',new_table_...
首先,我们需要创建一个新表来存储复制过来的表结构及数据。可以使用如下SQL语句来创建新表new_table: CREATE TABLE new_table LIKE old_table; 1. 这条语句的意思是创建一个新表new_table,其结构与已有表old_table相同,但不包含数据。 2. 复制表结构 接下来,我们需要复制已有表的结构到新表中。可以使用如下SQL...
I want to copy the structure of some columns from one table to another. The target table already exists but doesn't have columns with the name of the copied columns. How can this be done? Is this possible with some query of the information_schema?
read_sql('emp_master', engine) # Copy table structure with engine.connect() as con: con.execute('DROP TABLE if exists emp_backup') con.execute('CREATE TABLE emp_backup LIKE emp_master;') df.to_sql('emp_backup', engine, index=False, if_exists='append') 2.9 更新时间格式 代码语言:...
A metadata lock on a table prevents changes to the table's structure. This locking approach has the implication that a table that is being used by a transaction within one session cannot be used in DDL statements by other sessions until the transaction ends. ...
mysql>createtablet1(aint); Query OK,0rowsaffected (0.01sec) 前面已经提到,从库的 SQL 线程应用复制事务时使用此技术,将@@SESSION.gtid_next显式设置为在源服务器上分配给事务的 GTID。这意味着保留来自原始服务器的 GTID,而不是由从库生成和分配的新 GTID。即使从库禁用log_bin或log_slave_updates,或者事...
pt-online-schema-changealters a table’s structure without blocking reads or writes. Specify the database and table in the DSN. Do not use this tool before reading its documentation and checking your backups carefully. pt-online-schema-change是 Percona 公司开发的一个非常好用的 DDL 工具,称为...
ALTERTABLEtbl_name ENCRYPTION='Y', ALGORITHM=COPY; 4.Online DDL Performance and Concurrency Online DDL improves several aspects of MySQL operation: • Applications that access the table are more responsive【rɪˈspɑːnsɪv反应敏捷的;反应热烈的;热情的;反应敏捷;反应积极;】 because queries...
mysqladmin-h'other_hostname'createdb_namemysqldumpdb_name| mysql-h'other_hostname'db_name If you want to copy a database from a remote machine over a slow network, you can use these commands: mysqladmin createdb_namemysqldump-h'other_hostname'--compressdb_name| mysqldb_name ...
Hello I'm wondering if it's possible to copy a structure of a view table to an actual table? I've tried "CREATE TABLE tablename LIKE view_table" but it says it is not a BASE TABLE So is there anyway of doing that in mysql or do I have to make a php function for it?