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Syntax: UPDATE table_name SET column_name1 = new_value1, column_name2 = new_value2 ---- WHERE condition; Here table_name is the name of the table, column_name is the column whose value you want to update, new_value is the updated value, WHERE is used to filter for specific data.
Yep. And it would be possible to use a check constraint to ensure that only one row exists (using Celko's technique here sqlmonster.com/Uwe/Forum.aspx/ms-sql-server/3453/…)
UPDATE your_table SET likes = NULL
or if your likes column does not allow NULL:
UPDATE your_table SET likes = ''
Some SQL tools that are used for executing DB queries prevent updates on ALL records (queries without a where clause) by default. You can configure that and remove that savety setting or you can add a where clause that is true for all records and update all anyway like this:
UPDATE your_table
SET likes = NULL
WHERE 1 = 1
If you compare with NULL then you also need the IS operator. Example:
UPDATE your_table
SET likes = NULL
WHERE likes IS NOT NULL
because comparing NULL with the equal operator (=) returns UNKNOWN. But the IS operator can handle NULL.
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