varchar

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MySQL optimization - Difference between WHERE on VARCHAR and on MEDIUMINT

I\'ve been needing to do a lot of optimization on mysql queries and 开发者_开发知识库I am considering reworking queries on a user\'s account so that instead of performing a query \"WHERE username = a[详细]

2023-03-18 23:06 分类：问答
What is the correct SQL DataType to represent my Object?

My object is a string, implemented as an array of 1-50 US-ASCII data characters. What SQL Data Type should I use to represent this in my database table?[详细]

2023-03-18 22:22 分类：问答
TEXT vs VARCHAR in InnoDB MySQL 5.5. When to use each one

What are the main differences between text and varchar in InnoDB storage engine at MySQL 5.5? Is text or varchar(5000) used if we 开发者_如何学编程are talking about a variable text field of not more[详细]

2023-03-18 03:28 分类：问答
sybase varchar to datetime

I have to take a string that has month, day, year, hour, min AM/PM and select from a table that has a datetime column.How canI do this?I have seen some examples of custom queries, but this seems a bit[详细]

2023-03-17 14:58 分类：问答
Indexing on DateTime and VARCHAR fields in SQL Server 2000, which one is more effectient?

We have a CallLog table in Microsoft SQL Server 2000. The table contains CallEndTime field whose type is DATETIME, and it\'s an index column.[详细]

2023-03-17 03:11 分类：问答
MySQL/InnoDB Plugin: Will NULL values for VARCHAR fields still take up storage spaces?

I\'m using InnoDB Plugin in the Barracuda file format with: ROW_FORMAT=DYNAMIC If I define a field as VARCHAR(255), and then insert a record that has a NULL value for that field, will that record st[详细]

2023-03-15 21:50 分类：问答
Converting varchar to monthDate

I\'m receiving this error message: Conversion failed when converting the varchar value \'monthDate\' to data type int.[详细]

2023-03-15 01:29 分类：问答
MySQL -- insert a VARCHAR value from T1 into a DECIMAL field in T2

In Table_1, I have imported data from a spreadsheet.In one table column there are mixed values: 94.7, 45.0, 36, car, bus....etc.The datatype is VARCHAR(10)[详细]

2023-03-12 16:07 分类：问答
How are large text fields stored in mySQL?

For example, this field I am writing in now can holds a lot of text.I\'m assuming this is a mySQL VARCHAR or TEXT field but this is just a guess.According to MySQL: Large VARCHAR vs. TEXT? TEXT should[详细]

2023-03-11 08:12 分类：问答
Nvarchar perform better than varchar?

I am really surprisde to see that in my MS SQL table, I am defining a field varchar and doing group by with another table\'s field.[详细]

2023-03-10 11:47 分类：问答