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How to find gaps in sequential numbering in mysql?
We have a database with a table whose values were imported from another system. There is an auto-increment column, and there are no duplicate values, but there are missing values. For example, running this query:
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SQL Server 2005 How Create a Unique Constraint?
How do I create a unique constraint on an existing table in SQL Server 2005?
10 Answers
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How to have an automatic timestamp in SQLite?
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Just declare a default value for a field:
CREATE TABLE MyTable(
ID INTEGER PRIMARY KEY,
Name TEXT,
Other STUFF,
Timestamp DATETIME DEFAULT CURRENT_TIMESTAMP
);
However, if your INSERT command explicitly sets this field to NULL, it will be set to NULL.
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Improving bulk insert performance in Entity framework [duplicate]
I want to insert 20000 records in a table by entity framework and it takes about 2 min. Is there any way other than using SP to improve its performance. This is my code:
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How can I join multiple SQL tables using the IDs?
I have 4 different tables that I want to join. The tables are structured with columns as follows:
4 Answers
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quick random row selection in Postgres
I have a table in postgres that contains couple of millions of rows. I have checked on the internet and I found the following
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Tools to generate database tables diagram with Postgresql? [closed]
Are there any free tools to generate tables diagrams with Postgresql?
7 Answers
7
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Simple way to calculate median with MySQL
...ike: place / median for that place... like select place, median_value from table... any way? thanks
– saulob
Jan 18 '14 at 4:45
2
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CSS display: table min-height not working
...e know I can make min-height work with the latest browsers? I am using CSS tables and it seems to ignore min-height.
4 Answ...
Long press on UITableView
I would like to handle a long press on a UITableViewCell to print a "quick access menu".
Did someone already do this?
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