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I have a column called "Patient Type" in a table. I want to make sure that only 2 values can be inserted in to the column , either opd or admitted, other than that, all other inputs are not valid.
Below is an example of what I want
How do I make sure that the column only accepts "opd" or "admitted" as the data for "Patient Type" column.
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The CHECK constraint is used to limit the value range that can be placed in a column. If you define a CHECK constraint on a column it will allow only certain values for this column. If you define a CHECK constraint on a table it can limit the values in certain columns based on values in other columns in the row.
The CHECK constraint restricts values that can be entered into a table. It can contain search conditions similar to a WHERE clause. It can reference columns in the same table.
MySQL CONSTRAINT is used to define rules to allow or restrict what values can be stored in columns. The purpose of inducing constraints is to enforce the integrity of a database. MySQL CONSTRAINTS are used to limit the type of data that can be inserted into a table.
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I'm not a MySQL dev, but I think this might be what you're looking for. ENUM
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You need a check constraint.
ALTER TABLE [TableName] ADD CONSTRAINT
my_constraint CHECK (PatientType = 'Admitted' OR PatientType = 'OPD')
You need to check if it works though in MySQL in particular as of today.
Seems it does not work (or at least it did not a few years ago).
MySQL CHECK Constraint
CHECK constraint in MySQL is not working
MySQL CHECK Constraint Workaround
Not sure if it's fixed now.
If not working, use a trigger instead of a check constraint.
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While creating the table use Enum as data type for patientType column.
Create table [tablename](firstname varchar(size),[othercolumns],patientType ENUM('OPD','Admitted'))
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