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Assume active is a "boolean field" (tiny int, with 0 or 1)
# Find all active users select * from users where active # Find all inactive users select * from users where NOT active In words, can the "NOT" operator be applied directly on the boolean field?
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You can insert a boolean value using the INSERT statement: INSERT INTO testbool (sometext, is_checked) VALUES ('a', TRUE); INSERT INTO testbool (sometext, is_checked) VALUES ('b', FALSE); When you select a boolean value, it is displayed as either 't' or 'f'.
BOOLEAN can be used as a data type when defining a column in a table or a variable in a database procedure. Support for the BOOLEAN data type helps migrations from other database products. Boolean columns accept as input the SQL literals FALSE and TRUE.
You can update boolean value using UPDATE command. If you use the BOOLEAN data type, MySQL internally convert it into tinyint(1). It can takes true or false literal in which true indicates 1 to tinyint(1) and false indicates 0 to tinyint(1).
The BOOLEAN type represents a statement of truth (“true” or “false”). In SQL, the boolean field can also have a third state “unknown” which is represented by the SQL NULL value.
A boolean in SQL is a bit field. This means either 1 or 0. The correct syntax is:
select * from users where active = 1 /* All Active Users */ or
select * from users where active = 0 /* All Inactive Users */ If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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