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8 sty 2021 · TRUE and FALSE are not necessarily equivalent with 1 and 0. For one, they behave very differently when used in combination with the IS operator. For example, WHERE NOT(something IS 1) would be a syntax error, but WHERE NOT(something IS TRUE) works.
You can use the BOOL or BOOLEAN keyword as follows: column_name BOOL. In MySQL, the convention is that zero is considered false, while a non-zero value is considered true. When working with Boolean literals, you can use the constants true and false case-insensitively, which is equivalent to 1 and 0 respectively.
26 mar 2019 · Regarding the TRUE or FALSE, any int (int, tinyint, smallint, bigint) value can be used as (or converted to) a boolean value. It is considered FALSE if it is 0 and TRUE otherwise. So, 2 would count as TRUE .
Comparison operations result in a value of 1 (TRUE), 0 (FALSE), or NULL. These operations work for both numbers and strings. Strings are automatically converted to numbers and numbers to strings as necessary. The following relational comparison operators can be used to compare not only scalar operands, but row operands:
In SQL, all logical operators evaluate to TRUE, FALSE, or NULL (UNKNOWN). In MySQL, these are implemented as 1 (TRUE), 0 (FALSE), and NULL. Most of this is common to different SQL database servers, although some servers may return any nonzero value for TRUE.
Definition and Usage. The IF () function returns a value if a condition is TRUE, or another value if a condition is FALSE. Syntax. IF (condition, value_if_true, value_if_false) Parameter Values. Technical Details. More Examples. Example. Return 5 if the condition is TRUE, or 10 if the condition is FALSE: SELECT IF(500<1000, 5, 10);
Summary. Use IF...THEN statement to conditionally execute a block of statements based on the evaluation of a specified condition. Use IF...THEN...ELSE statement to execute a block of statements if a specified condition is true and an alternative block of statements if the condition is false.
