varchar

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How can I trim certain characters from a string in sql?

I would like to trim all special characters from a string in SQL. I\'ve seen a bunch of people who use substring methods to remove a certain amount of characters, but in this case 开发者_StackOverflow[详细]

2022-12-30 18:38 分类：问答
MySQL VARCHAR strange column behavior

I have the following SQL statement which returns a single record as expected: select * from geodatasource_cities C,[详细]

2022-12-30 09:40 分类：问答
Varchar(255) to Varchar(MAX)

Is it possible to change a column type in a SQL Server 2008 database from varchar(255) to varchar(MAX) without having to drop the table and recreate?[详细]

2022-12-28 02:04 分类：问答
django select max field from mysql when column is varchar

Using Django 1.1, I am trying to select the maximum value from a varchar column (in MySQL.)The data stored in the column looks like:[详细]

2022-12-27 01:27 分类：问答
Are there disadvantages to using VARCHAR(MAX) in a table?

Here is my predicament. Basically, I n开发者_开发知识库eed a column in a table to hold up an unknown length of characters. But I was curious if in Sql Server performance problems could arise using a[详细]

2022-12-25 19:37 分类：问答
Postgres: Reduce varchar size and truncate

I currently have a Postgres 8.4 database that contains a varchar(10000) column. I开发者_Python百科\'d like to change this into a varchar(255) and truncate any data that happens to be too long. How can[详细]

2022-12-23 12:58 分类：问答
Converting this varchar to a decimal with the appropriate decimal point?

I\'ve been playing with cast()s and such with this and can\'t seem to get things to work.I have a varchar string that\'s 18 开发者_StackOverflow中文版characters long that I\'d like to convert or cast[详细]

2022-12-21 02:06 分类：问答
SQL Server - Better Data type to store large string value

we have a database table which has around 200,000 records. which includes 3 ntext columns, which hold string data with length vary from 4000-70000.but a mere selection on the table takes more than 1 m[详细]

2022-12-17 13:52 分类：问答
varchar(max) everywhere?

Is there any problem with making all your Sql Server 2008 string columns varchar(max)? My allowable string sizes are managed by the application.The database should just persist what I give it. Will I[详细]

2022-12-17 07:11 分类：问答
Select by varchar column with IN() part in condition and int value returns all rows

Can someone explain me why with that query: SELECT * FROM `tags` WHERE (tag IN (\'willa-lentza\', 2016))[详细]

2022-12-16 15:04 分类：问答