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Modifying a table definition (DDL) is a very painful process for an 7*24 online production system, because if you use the ALTER statement directly, an exclusive lock is placed on the table, meaning that all of the DML and select cannot be manipulated during that time, and if it is a large table, Alter will have a very long time, and the application will be greatl
Tags: MySQL table structure view table structure Modify field modificationFirst, view the data table structure1) View the table basic Structure statement DESCRIBESyntax: DESCRIBE table name;Example:Mysql> DESCRIBE product;+--------------+--------------+------+-----+---------
Reprinted from http://blog.csdn.net/cuker919/article/details/8514253Select Segment_name, bytes as sizeFrom User_segmentswhere Segment_type = ' TABLE ' and segment_name in (' view_jlzdh_mp_dl_day_01 ', ' view_jlzdh_mp_dl_day_02 ', ' View_jlzdh_mp_ Dl_day_03 ',' View_jlzdh_mp_dl_day_04 ', ' view_jlzdh_mp_dl_day_05 ', ' view_jlzdh_mp_dl_day_06 ',' view_jlzdh_mp_dl_day_07 ', ' view_jlzdh_mp_dl_day_08 ', ' view_jlzdh_mp_dl_day_09 ',' View_jlzdh_mp_dl_day_1
Query the information of an oracle table (table, field, constraint, index) by column name + Table name query constraint name SELECT * FROM USER_CONSTRAINTS WHERE table_name = upper ('org _ info ') SELECT * FROM USER_CONSTRAINTS WHERE CONSTRAINT_NAME = upper ('sys _ C0065894 '); alter table ORG_INFO add foreign key (par
Label:Connect and DisconnectConnectionMysql-h Host-u User-p (that is, the connected host, user name, and password used).DisconnectEnter quit (or \q) to exit at any time:Table ManagementClone tableNote: The CREATE TABLE ... like statement does not clone the foreign key definition of the table, and does not clone the data directory and index directory that the original ta
Table replication in MySQL: create table like and create table as select, tables in mysql Copy codeThe Code is as follows:CREATE TABLE A LIKE B In this way, when table B is copied to Table A, the complete field structure and ind
Tool used from http://project-rainbowcrack.com/index.htm#downloadBasic Steps: generate a rainbow table (rtgen) --> sort (rtsort) --> crack (rcrack)To generate a rainbow table, run the following command:Rtgen hash_algorithm charset plaintext_len_min plaintext_len_max table_index chain_len chain_num part_index two parameters are not very easy to understand: table_index and part_index. If you want to study it
1. Complete parsing of Windows route tables Time can be amazing in this way. People tend to think that computer technology is a high technology, but TCP/IP has appeared in various forms over the past thirty years and is ubiquitous. Therefore, the TCP/IP protocol has time to become more mature and more stable and reliable. However, when it comes to computers, things are not that simple. When the route package passes Network Sometimes, an error occurs. In this case, it is very helpful to be
CREATE TABLE A like BThis way, when you copy table B to a, the complete field structure and index of table B is copied to table A.CREATE TABLE A as SELECT x,x,x,xx from B LIMIT 0This method only copies the field structure of Table
Label:1 CREATE TABLE A like BThis way, when you copy table B to a, the complete field structure and index of table B is copied to table A.2. CREATE TABLE A as SELECT * from BThis method only copies the field structure of Table B t
There may be a situation where you need an identical replica table create TABLE ... The select is not appropriate because the copy must contain the same index, default, and so on. You can handle this situation by following the steps below. Use show create table to get the structure, index, and so on of the specified source
One: Detailed explanation of MAC Address Table When it comes to the MAC address table, you have to say how the switch works, because the switch forwards the data frames based on the MAC address table. There is a table in the switch that records the relationship between the MAC address of the LAN host and the Switch in
Bootstrap table is lightweight and feature-rich data displayed in tabular form, supporting radio, check boxes, sorting, paging, show/Hide columns, fixed title scrolling table, responsive design, AJAX loading JSON data, click Sorted columns, card views, etc. Today, the use of bootstrap table's parent-child tables and row-and-column sequences is introduced to a slightly more advanced point. Bootstrap
Query all table names: Select T.table_name from User_tables t; Query all field names: Select T.column_name from user_col_comments t; Query all field names for the specified table: Select T.column_name from user_col_comments t where T.table_name = ' biz_dict_xb '; Query all field names and field descriptions for the specified table: Select T.column_name, t.
The syntax is as follows:1. Description: copy a table (only copy structure, source table name: a new table name: B) (access available)Method 1: Select * into B from a where 1 Method 2: Select top 0 * into B from 2. Description: copy a table (copy data, source table name: A t
A: MAC Address Table detailedWhen it comes to the MAC address table, you have to say how the switch works because the switch forwards the data frame based on the MAC address table. There is a table in the switch that records the corresponding relationship between the MAC address of the LAN host and the switch interface
(1): Query whether a table exists in a database ( two ways): Assuming that the table name is table_nameif exists (select * from sysobjects where name= ' table_name ')DROP TABLE table_nameIf OBJECT_ID (' table_name ') is NOT nullDROP TABLE table_nameThe same operation can also be used to determine whether the database e
MSSQLServer longitudinal table to transverse table transverse table to longitudinal table To create a table statement and insert a data statement: CREATE TABLEtest_y ([Name] [nchar](Ten)NULL, [Course] [nchar](Ten)NULL, [Grade] [int] NULL) Insert intoTest_yValues('Zhan
Free up space for MySQL ibdata1 fileMysqldump options:--add-drop-table: Adds a statement that deletes a database table before each database table statement is created;--add-locks: Lock database tables when backing up database tables;--all-databases: Back up all databases on the MySQL server;--comments: Add comment information;--compact: Compression mode, resultin
Solemn declaration: original reproduced in http://dengqi.blog.51cto.com/5685776/1223132Salute to Good articles!!!A: MAC Address Table detailedWhen it comes to the MAC address table, you have to say how the switch works because the switch forwards the data frame based on the MAC address table. There is a table in the sw
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