oracle sql equals null

(col1 is null and col2 is not null) or (col1 is not null and col2 is null) ...

(col1 is null and col2 is not null) or (col1 is not null and col2 is null) or (col1!= col2) Tom, are there any plans to make DECODE available in PL/SQL (of course.

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I know that I can´t compare null values (because the result is unknow), so ...

I know that I can´t compare null values (because the result is unknow), so I want to . it's a SQL-only function that is unrecognized by PL/SQL For the benefit of.

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One of the most mindboggling values in the Oracle database is the NULL valu...

One of the most mindboggling values in the Oracle database is the NULL value. What is NULL? NULL is nothing. NULL is not even the same.

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If a field in a table is optional, it is possible to insert a new record or...

If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this field. Then, the field will be saved with a NULL.

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The MS Access IsNull() function returns TRUE (-1) if the expression is a nu...

The MS Access IsNull() function returns TRUE (-1) if the expression is a null value, otherwise FALSE (0): The Oracle NVL() function achieves the same result.

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SQL> DECLARE 2 CURSOR B IS 3 SELECT batch_id, equipment_id 4 FROM batch;...

SQL> DECLARE 2 CURSOR B IS 3 SELECT batch_id, equipment_id 4 FROM batch; 5 v_t1 NUMBER; 6 v_t2 NUMBER; 7 v_c1 NUMBER;.

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Either produce different SQL depending on the contents of that parameter, o...

Either produce different SQL depending on the contents of that parameter, or alter your SQL like this: WHERE (column2 = variableY) OR.

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In fact, NULL is untyped in the SQL language, which is why you cannot valid...

In fact, NULL is untyped in the SQL language, which is why you cannot validly use it in an equality . Oracle treats NULL as an unknown value.

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ORACLE-BASE - A summary of the functions available for handling NULL values...

ORACLE-BASE - A summary of the functions available for handling NULL values. SQL> SELECT * FROM null_test_tab WHERE col1 IS NULL ORDER BY id;.

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by Bill Rawlinson — on oracle, decode, sql 15 Nov The first thing you have ...

by Bill Rawlinson — on oracle, decode, sql 15 Nov The first thing you have to remember is NULL!= NULL. Thus you can't just check a.

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One of the most common questions SQL beginners have is why NULL values “don...

One of the most common questions SQL beginners have is why NULL values “don't work right” in WHERE clauses. In this article I'll explain it in.

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On the surface, it may appear that the SQL clauses IN and EXISTS are Only I...

On the surface, it may appear that the SQL clauses IN and EXISTS are Only IS NULL would return true on a NULL value and return a row.

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How to use between.. and in SQL. How to use LIKE, IN, IS NULL in SQL....

How to use between.. and in SQL. How to use LIKE, IN, IS NULL in SQL.

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Understand Oracle null values. Well actually, a NULL is UNKOWN not the abse...

Understand Oracle null values. Well actually, a NULL is UNKOWN not the absence of a value. SQL> select count(*) from test where object_id is not null;.

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Null (or NULL) is a special marker used in Structured Query Language (SQL) ...

Null (or NULL) is a special marker used in Structured Query Language (SQL) to indicate that a . In an Oracle RDBMS for example NULL and the empty string are considered the same thing and therefore 'Fish ' || NULL || 'Chips' results in 'Fish.

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