An expression of non-boolean type specified in a context where a condition is expected, near ‘%.*ls’.

Error Message:
Msg 4145, Level 15, State 1, Line 7
An expression of non-boolean type specified in a context where a condition is expected, near ‘%.*ls’.

Severity level:
15.

Description:
This error message appears when you try to use a non-boolean expression in the context where a boolean expression is expected.

Consequences:
The SQL statement cannot be parsed and further execution is stopped.

Resolution:
Error of the Severity level 15 are generated by the user and can be fixed by the SQL Server user. The statement cannot be run this way. It must evaluate to a boolean result.

Versions:
All versions of SQL Server.

Example(s):
IF OBJECT_ID(‘dbo.t’) IS NOT NULL
    DROP TABLE dbo.t;
GO

CREATE TABLE dbo.t
(
    c1 int
);
GO

SELECT
    c1
FROM
    dbo.t
WHERE
    1;

Remarks:
In the above example we try to run a query that tries to use the non-boolean expression 1 in the WHERE clause. This raises the error.



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