What is the difference between IS TRUE and =True query conditions in MySQL?
Apr 19, 2025 pm 06:54 PM Detailed explanation of the differences between MySQL IS TRUE
and = TRUE
query conditions
When processing Boolean values ??(BOOLEAN), there may be differences in the query results of IS TRUE
and = TRUE
. This is mainly due to the different ways in which MySQL handles boolean values ??and numeric values. Let's explain this difference with an example.
Suppose there is a table named user
that contains a field named is_deleted
, of type tinyint(1)
. The table data is as follows:
id | name | is_deleted |
---|---|---|
1 | Alice | 0 |
2 | bob | 1 |
3 | carol | 127 |
IS TRUE
query:
When the following query is executed:
SELECT * FROM `user` WHERE is_deleted IS TRUE;
The result contains records with is_deleted
values ??1 and 127:
id | name | is_deleted |
---|---|---|
2 | bob | 1 |
3 | carol | 127 |
IS TRUE
determines whether Boolean is true or false. In MySQL, any non-zero value is considered true.
= TRUE
query:
Execute the following query:
SELECT * FROM `user` WHERE is_deleted = TRUE;
The result only contains records with is_deleted
value of 1:
id | name | is_deleted |
---|---|---|
2 | bob | 1 |
= TRUE
performs a numerical comparison, and TRUE
is regarded as a numerical value of 1 by MySQL.
Summarize:
In MySQL, IS TRUE
and = TRUE
behave differently when processing tinyint(1)
type boolean fields:
-
IS TRUE
: Treat any non-zero value as true (TRUE). -
= TRUE
: Only value 1 is considered true (TRUE).
Therefore, which query method to choose depends on your needs. If you want to treat all nonzero values ??as true, use IS TRUE
; if you want to treat the value 1 as true, use = TRUE
. It should be noted that to avoid ambiguity, it is recommended to use an explicit numerical comparison ( is_deleted = 1
) to represent the Boolean TRUE
instead of using = TRUE
.
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