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一般我们在备份数据库的时候,如果比较小的数据库直接用phpmyadmin导出和导入进行备份还原还是没有多大问题的,如果数据库比较大或者可能考虑到完整性,还是建议采用mysqldump和mysql命令进行备份和还原数据库。今天在备份一个服务器数据库的时候有出现"mysqldump: command not found"错误提示。
Example 7: Describing a Specific Table Execute the “\d” command followed by the table name to describe a specific table in Postgres: \demp_data; The above-stated command will describe the “emp_data” table: The stated command retrieves all the details regarding the “emp_data” table, ...
0 - This is a modal window. No compatible source was found for this media. Oracle Syntax ALTERTABLEtable_nameMODIFYCOLUMNcolumn_name datatype; Example Following query modifies datatype of SALARY column in MySQL CUSTOMERS table − ALTERTABLECUSTOMERSMODIFYCOLUMNIDDECIMAL(18,4); ...
--html HTML table output mode -t, --tuples-only print rows only -x, --expanded turn on expanded table output -z, --field-separator-zero set field separator for unaligned and CSV output to zero byte -0, --record-separator-zero set record separator for unaligned and CSV output to zero...
Do you need to remember all of them and the context in which they are relevant? Not at all. That’s where a different verb DESCRIBE comes handy; it shows the attributes of an object, similar to what the describe command in SQL*Plus command does for a table to display the columns. ...
describe 表名; 显示数据表的结构 create database 库名; 建库 use 库名; create table 表名 (字段设定列表); 建表 drop database 库名; drop table 表名; 删库和删表 delete from 表名; 将表中记录清空 select * from 表名; 显示表中的记录 ...
describe 表名; 显示数据表的结构 create database 库名; 建库 use 库名; create table 表名 (字段设定列表); 建表 drop database 库名; drop table 表名; 删库和删表 delete from 表名; 将表中记录清空 select * from 表名; 显示表中的记录 ...
The reason for this is that any common features between all the implementations of the command are discussed once under the SQL99 topic. Thus, reading directly about a vendor’s implementation of a particular command may not describe every aspect of that command, since some of its details may...
status : show status of this connection tables | views | rehash : list available user objects describe <tablename> : describe a database object tree-view <tablename> : tree representation of connected tables dump-out | dump-in | verify-dump | dump-conditional: handle table dumps system | ...