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Add Foreign Key to existing table
I want to add a Foreign Key to a table called "katalog".
13 Answers
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How do I change the hover over color for a hover over table in Bootstrap?
I have a table with class 'table-hover'. The default hover over color is a white / light grey. How do I change this color?
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SQLite add Primary Key
I created a table in Sqlite by using the CREATE TABLE AS syntax to create a table based on a SELECT statement. Now this table has no primary key but I would like to add one.
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How to ALTER multiple columns at once in SQL Server
I need to ALTER the data types of several columns in a table.
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If table exists drop table then create it, if it does not exist just create it
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Just put DROP TABLE IF EXISTS `tablename`; before your CREATE TABLE statement.
That statement drops the table if it exists but will not throw an error if it does not.
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Oracle: If Table Exists
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The best and most efficient way is to catch the "table not found" exception: this avoids the overhead of checking if the table exists twice; and doesn't suffer from the problem that if the DROP fails for some other reason (that might be important) the exception is still rai...
sql query to return differences between two tables
I am trying to compare two tables, SQL Server, to verify some data. I want to return all the rows from both tables where data is either in one or the other. In essence, I want to show all the discrepancies. I need to check three pieces of data in doing so, FirstName, LastName and Product.
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How can I list all foreign keys referencing a given table in SQL Server?
I need to remove a highly referenced table in a SQL Server database. How can I get a list of all the foreign key constraints I will need to remove in order to drop the table?
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Check if a temporary table exists and delete if it exists before creating a temporary table
I am using the following code to check if the temporary table exists and drop the table if it exists before creating again. It works fine as long as I don't change the columns. If I add a column later, it will give an error saying "invalid column". Please let me know what I am doing wrong.
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Tables instead of DIVs [duplicate]
Under what conditions should you choose tables instead of DIVs in HTML coding?
24 Answers
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