Database Administrator

MySQL DATE_FORMAT () function Definition and usageThe DATE_FORMAT () function is used to display date/time data in different formats. SyntaxDATE_FORMAT (date, format)The date parameter is a valid date. Format specifies the output format of the

No downtime Xtrabackup creating slave nodes Master: 10.1.1.17: 3306Slave: 10.1.1.18: 3307Complete the Basic Environment configuration of the slave node: Create mysql users, install mysql software of the same version, xtrabackup software package,

Oracle uses the comment statement to add Table Comments, oraclecommentThe oracle comment statement can be used to add remarks to tables, fields, views, and other objects.Syntax:Comment on TABLE table_name IS 'Remarks ';Permission requirements:By

Introduction to memcached and basic commands. Introduction to memcached commands [Introduction ]: Memcached is a high-performance distributed memory object Cache System for dynamic Web applications to reduce database load. It caches data and objects

MongoDB performs CRUD operations on images-combined with JAVA, mongodbcrud The previous blog briefly introduced how to install MongoDB, how to operate MongoDB in dos, and how to solve the errors in installing MongoDB. Of course, these are not enough.

Oracle shrink table use case, oracleshrink There is a serious shortage of External table space in the site, and the customer does not want to resize it. To clean up some data, it is a large field blob. the tablespace is 1 TB and 0.99 TB has been

Navicat Premium introduces the Chinese garbled code solution for SQL import, navicatpremium When I asked a friend for a bug today, I was ready to import the data in her database, so I tried to import the corresponding mysql command under the mysql

Use CodeFirst for dynamic database creation and codefirst for dynamic database creation In the project ITOO3.0, a technical point is to dynamically create databases and tables. After a simple explanation, we will dynamically create a complete set of

Use the Navicat tool to synchronize the MySQL database structure. Navicat is a fast, reliable, and cost-effective database management tool designed to simplify database management and reduce system management costs. Navicat provides up to 7

[Php] uses php constructor and destructor to compile the Mysql DataBase Query Class and constructor mysql In the previous article "[php] uses the original JavaScript Ajax for MVC hierarchical design for php and is compatible with IE6" (click to open

Bug and SQLSERVERbugToday, the customer reported that there was a bug in ms SQL, and the problem was quite big. So we made a mark:Open the SQL query window and paste the following code: Declare @ I intset @ I = 1 while @ I 2 -- determine if 1 is

Mysql Regular Expression Regular ^ match the start part of the string $ match the end part of the string. represents any character in the string, including carriage return and line feed [Character Set combination] matching any character in

SQL with as usage and writing of recursive functions, SQL Recursion1. Meaning of WITHThe with as phrase, also known AS subquery factoring, allows you to do a lot of things and define an SQL segment, which will be used by the entire SQL statement.

Oracle is not equal to the number. oracle is equal to the number. In Oracle, non-equal signs can be used in the following ways:<> ,! =, ^ =   Test SQL create table test( id int, name varchar2(10), age int)insert into test(id,name,age)

Detailed usage of record, varray, table, % type, and % rowtype in ORACLE, varray % type 1 Note 1.1 RECORD Define the record data type. It is similar to the STRUCTURE in C language. PL/SQL provides a holistic approach to combine several related,

Question 6: MySQL ---------- Employees Earning More Than Their Managers, morethanicansay TheEmployeeTable holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id. +----+-------+--------+-

Oracle trunc () function usage, oracletrunc -- Oracle trunc () function usage/************** Date TRUNC () the function does not have second precision ********************/ Select sysdate from dual -- date at that time Select trunc (sysdate) from

Oracle listparts deduplication method, oraclelistparts deduplication1. Use a regular expression to remove duplicates SELECT regexp_replace('2,2,3,4,5 ', '([^,]+)(,\1)+', '\1') AS col FROM dualQuery results: SQL> SELECT regexp_replace('2,2,3,4,5 '

ORACLE 11G trigger debug record Error: PLS-00201: identifier 'sys. DBMS_SYSTEM 'must be declared, oracle11g  1. The trigger content is as follows: Create or replace trigger "LOGON_DENIED_TO_ALERT" AFTER servererror ON DATABASE DECLARE Message

Oracle FORALL usage (batch addition, deletion, and modification), oracleforall A key improvement of FORALL statements, which greatly simplifies code and significantly improves performance for programs that want to update many rows of data in PL/SQL