Database

mysql Basic syntax of database

mysql Basic syntax of database DDL Operation creation database syntax ：create database Database name ; View all database syntax ：show databa...
2021-04-05 16:30 views 12

The induction and arrangement of paradigms （1NF,2NF,3NF,BCNF）

The first paradigm (1NF) The second normal form of standard table (2NF) The third normal form of partial functional dependence (3NF) transfe...
2021-04-01 09:12 views 6

27 Year old invention SQL in the future , God took him away

1974 year , Turing prize winner Charles · Bachman attends a database Conference , I met Edgar · Corder . Codd hasn't got a Turing Award yet , But i...
2021-01-27 08:51 views 5

Oracle2021 Annual safety warning ,8 There are two security vulnerabilities that need attention

| news flash Oracle company to 2021 year 1 month 19 day , The first annual security alert was issued . among , yes 8 Safety warnings an...
2021-01-20 13:57 views 8

First knowledge MySQL Comprehensive review （ dried food ）

In daily development and data query , We need to join multiple tables equivalently or left and right to query the related fields. Of course, we ne...
2020-12-25 14:10 views 6

JAVA Interview questions -Mysql database

1. Introduce them separately innodb and myisam?MyIASM yes MySQL Default engine , However, it does not provide support for database transactions ...
2020-12-03 11:14 views 10

Error updating database.  Cause: java.sql.SQLSyntaxErrorException: ORA-00947: Not enough values

### Error updating database. Cause: java.sql.SQLSyntaxErrorException: ORA-00947: There are not enough values ### The error may involve com.esoon.i...
2020-12-02 18:04 views 10

Bug Can data be used as the basis of technical personnel assessment KPI?

As a software developer who lives by code , Available functions and Bug It's always mutual . There was a product iteration review meeting , I put ...
2020-11-29 14:18 views 3

sql server Add, delete, modify and query database （ Library and table ）

sql server Table add modify field modify table name add constraint view table structure instance package
2020-11-07 01:12 views 5

One MySQL I'll just hang you up , How dare you write on your resume “ master ”?

as everyone knows , Resume “ understand ＝ I've heard of names ; be familiar with ＝ Know what it is ; skilled ＝ Used ; master ＝ Made something ; Tw...
2020-10-26 20:20 views 6
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