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Create unique constraint with null columns
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Create two partial indexes:
CREATE UNIQUE INDEX favo_3col_uni_idx ON favorites (user_id, menu_id, recipe_id)
WHERE menu_id IS NOT NULL;
CREATE UNIQUE INDEX favo_2col_uni_idx ON favorites (user_id, recipe_id)
WHERE menu_id IS NULL;
This way,...
How do I perform an insert and return inserted identity with Dapper?
How do I perform an insert to database and return inserted identity with Dapper?
7 Answers
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Django select only rows with duplicate field values
suppose we have a model in django defined as follows:
5 Answers
5
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Delete a single record from Entity Framework?
I have a SQL Server table in Entity Framework named employ with a single key column named ID .
15 Answers
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Ordering by the order of values in a SQL IN() clause
I am wondering if there is away (possibly a better way) to order by the order of the values in an IN() clause.
13 Answers
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How to get CSS to select ID that begins with a string (not in Javascript)?
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[id^=product]
^= indicates "starts with". Conversely, $= indicates "ends with".
The symbols are actually borrowed from Regex syntax, where ^ and $ mean "start of string" and "end of string" respectively.
See the specs for full information.
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Return a value if no rows are found in Microsoft tSQL
Using a Microsoft version of SQL, here's my simple query. If I query a record that doesn't exist then I will get nothing returned. I'd prefer that false (0) is returned in that scenario. Looking for the simplest method to account for no records.
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android get all contacts
How can I get all the names of the contacts in my Android and put them into array of strings?
8 Answers
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Android custom dropdown/popup menu
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Update: To create a popup menu in android with Kotlin refer my answer here.
To create a popup menu in android with Java:
Create a layout file activity_main.xml under res/layout directory which contains only one button.
Filename: activity_main.xml
<R...
How to convert a Django QuerySet to a list
I have the following:
9 Answers
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