1) Find the duplicate records and classify them into a new table. max(id) is the record you want to delete
create table ttt as select gallery_url ,max(id) as< /span> theid from gallery group
Category: Database
The database is a warehouse that organizes, stores and manages data according to the data structure. It was created more than 60 years ago. With the development of information technology and the market, especially after the 1990s, data management is no longer just It is to store and manage data, and transform it into various data management methods required by users. There are many types of databases, from the simplest tables that store various data to large-scale database systems that can store massive amounts of data. They have been widely used in all aspects.
Sleep caused by SQLite during execution
Is there a similar SQL expression that sleeps like MS SQL WAITFOR sqlite?
Or, is there a way to make sqlite SQL queries run for a long time without adding many rows to the database?
Thi
PowerDesigner common skill
PowerDesigner is a very powerful database design software. Skilled use of PowerDesigner can make database design efficient and concise. The specific operations of PowerDesign are described in detai
Generate a table structure to the Word document using PowerDesigner
Sometimes, when writing various system-related documents, you need to add the structure of the database table to the document. If you manually If you add it, it’s very ridiculous.
There are m
How to execute multiple RSQLite statements at a time or how to dump the entire file?
Using RSQLite to build a SQLite database I want to send multiple statements at once-is this possible?
Why these don’t work:
sql <- readLines("createtables.sql") dbSendQuery(con,sql ) ……
PowerDesigner exports data table structure to Excel all table structure in the same sheet
Option Explicit
Dim rowsNum
rowsNum = 0
‘————————————————- —————————-
‘Main function
‘————————————————- —–
PowerDesigner imports PowerDesigner in accordance with the Excel design data table structure
Option Explicit
Dim shet, cnt
‘————————————————- –
‘For each shet in array(“Sheet1”, “Sheet2”, “Sheet3″…)
‘————————————————- –
Dim
SQLITE C interface Get single-value results
When I enter Sqlite
SELECT Count(*) FROM tabl; It returns a Number.
How to use the C interface to get this number after preparing the statement?
Something like this:
sqlite3
SQLITE3.PROGRAMMINGERROR: Unable to run on the closed database. [Python] [SQLite]
I am using a common function to execute all the sqlite queries in the class. Everything works fine until I use a for loop with multiple items in the list. This is a commonly used function for exec
PowerDesigner generates an Excel version of the database file
To convert the database design to an excel version, Baidu will publish a script file, which is easy to use and find out, keep a memorial
In pd, shift+ctrl+X, open the script to run, the scrip