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How to do a regular expression replace in MySQL?
I have a table with ~500k rows; varchar(255) UTF8 column filename contains a file name;
13 Answers
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How do I get the row count of a pandas DataFrame?
...use the .shape property or just len(DataFrame.index). However, there are notable performance differences ( len(DataFrame.index) is fastest).
Code to reproduce the plot:
import numpy as np
import pandas as pd
import perfplot
perfplot.save(
"out.png",
setup=lambda n: pd.DataFrame(np.arange...
How can I use mySQL replace() to replace strings in multiple records?
...
At a very generic level
UPDATE MyTable
SET StringColumn = REPLACE (StringColumn, 'SearchForThis', 'ReplaceWithThis')
WHERE SomeOtherColumn LIKE '%PATTERN%'
In your case you say these were escaped but since you don't specify how they were escaped, let's s...
How to get current date & time in MySQL?
...ccepted answers, I think this way is also possible:
Create your 'servers' table as following :
CREATE TABLE `servers`
(
id int(11) NOT NULL PRIMARY KEY auto_increment,
server_name varchar(45) NOT NULL,
online_status varchar(45) NOT NULL,
_exchange varchar(45) NOT NULL,
...
How to restore to a different database in sql server?
...M, COPY_ONLY, FORMAT, INIT, STATS = 100;
-- Get the backup file list as a table variable
DECLARE @BackupFiles TABLE(LogicalName nvarchar(128),PhysicalName nvarchar(260),Type char(1),FileGroupName nvarchar(128),Size numeric(20,0),MaxSize numeric(20,0),FileId tinyint,CreateLSN numeric(25,0),DropLSN n...
Cannot insert explicit value for identity column in table 'table' when IDENTITY_INSERT is set to OFF
...tionId that is an identity column.
You can turn on identity insert on the table like this so that you can specify your own identity values.
SET IDENTITY_INSERT Table1 ON
INSERT INTO Table1
/*Note the column list is REQUIRED here, not optional*/
(OperationID,
OpDescription...
How to see full query from SHOW PROCESSLIST
...ck on the "Full texts" option ("← T →" on top left corner of a results table) to see untruncated results.
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How are people managing authentication in Go? [closed]
...rmatted):
"I would suggest something like the following design:
create table User (
ID int primary key identity(1,1),
Username text,
FullName text,
PasswordHash text,
PasswordSalt text,
IsDisabled bool
)
create table UserSession (
SessionKey text primary key,
UserID int not null, -- Cou...
How do you convert a byte array to a hexadecimal string, and vice versa?
...)
Text: 718,380.63 (1.0X faster)
Sentence: 39.71 (1.0X faster)
Lookup tables have taken the lead over byte manipulation. Basically, there is some form of precomputing what any given nibble or byte will be in hex. Then, as you rip through the data, you simply look up the next portion to see what...
Use didSelectRowAtIndexPath or prepareForSegue method for UITableView?
I'm using storyboards and I have a UITableView. I have a segue setup that pushes from my table to the detail VC. But which method should I use to handle this? I'll have to pass a couple objects to the detail view. But do I use didSelectRowAtIndex or -(void)prepareForSegue:(UIStoryboardSegue *...