大约有 6,100 项符合查询结果(耗时:0.0267秒) [XML]

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Using a Single Row configuration table in SQL Server database. Bad idea?

... I have done this two ways in the past - a single row table and a key/value pair table - and there are positives and negatives to each approach. Single Row positive: the values are stored in the correct type positive: it is easier to deal with in code (due to the above) positiv...
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Drop multiple tables in one shot in mysql

How to drop multiple tables from one single database at one command. something like, 4 Answers ...
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Difference between clustered and nonclustered index [duplicate]

I need to add proper index to my tables and need some help. 6 Answers 6 ...
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How does database indexing work? [closed]

... N/2 block accesses (on average), where N is the number of blocks that the table spans. If that field is a non-key field (i.e. doesn’t contain unique entries) then the entire tablespace must be searched at N block accesses. Whereas with a sorted field, a Binary Search may be used, which has log2 ...
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How do I search an SQL Server database for a string?

... This will search every column of every table in a specific database. Create the stored procedure on the database that you want to search in. The Ten Most Asked SQL Server Questions And Their Answers: CREATE PROCEDURE FindMyData_String @DataToFind NVARCHAR(40...
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How to list of all the tables defined for the database when using active record?

How do I get a list of all the tables defined for the database when using active record? 5 Answers ...
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Make column not nullable in a Laravel migration

I'm writing a migration to make certain columns in a table nullable right now. For the down function, I of course want to make those columns not nullable again. I looked through the schema builder docs , but couldn't see a way to do this. ...
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How to add an auto-incrementing primary key to an existing table, in PostgreSQL?

I have a table with existing data. Is there a way to add a primary key without deleting and re-creating the table? 4 Answer...
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Add timestamps to an existing table

I need to add timestamps ( created_at & updated_at ) to an existing table. I tried the following code but it didn't work. ...
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Add border-bottom to table row

I have a table of 3 by 3. I need a way to add a border for the bottom of every row tr and give it a specific color. 16 An...