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UNION ALL SELECT NULL, *, NULL, NULL FROM email ... Use of an unqualified * with other items in the select list may produce a parse error. ... select NULL, email.*, NULL, NULL from email ... the tables when only using one table and selecting literals in addition to all the columns on that single...


All queries in an SQL statement containing a UNION operator must have an equal number of expressions in their target lists. Change the first part of the query to a null or negative value so we can see what field will echo data back to us.


▸ abcd' UNION ALL SELECT NULL,(SELECT version())--. Let’s fetch the current db user. current_user variables and the getpgusername() function: ▸ abcd' UNION ALL SELECT NULL,(SELECT user)


Microsoft PowerPoint - SQLinjectionNotOnly.ppt
1'))) UNION ALL SELECT NULL, Concatenated SQL query# AND ((('RaNd' LIKE 'RaNd. You’ve got a SQL injection point vulnerable to UNION query technique detected by: ORDER BY clause brute-forcing NULL brute-forcing Sequential number brute-forcing.


Microsoft PowerPoint...
Comparisons Involving NULL and Three-Valued Logic. Meanings of NULL. Unknown value Unavailable or withheld value Not applicable attribute. Each individual NULL value considered to be different from every other NULL value SQL uses a three-valued logic: TRUE, FALSE, and UNKNOWN.


SQL Injection
1234' and account=NULL; -- For mysql, there must be white space after --. You are identified as name userid. – We know account is a valid field name, because. 1234' or 1=1 union select null from balances; -- The used SELECT statements have a different number of columns.


Null Session Enumeration from a
Null Session Enumeration from a Windows-Based System. The first step in enumerating CIFS/SMB is to connect to the service using the Exercise 1: Creating a null session from your Windows attack system: 1. From a Windows attack system command shell, type the following (only type what’s in bold)


242-31: SQL Set Operators: So Handy Venn You Need Them
The UNION, INTERSECT, and EXCEPT operators by default purge duplicate rows (although the optional ALL keyword can be used to preempt this behavior). Because OUTER UNION results typically include mismatched columns, filled in with missing values, the very concept of duplicate rows is...


SQL Injection in Oracle Webapps
SELECT firstname, lastname FROM customers UNION SELECT username, null FROM ALL_USERS ORDER BY 1,2. The most common techniques are the usage of "ORDER BY" or adding NULL values to the second query. SELECT * FROM table UNION.


Microsoft Word - Blindfolded SQL Injection - Final.doc
Once the NULL-based UNION statement works, it is a trivial process to identify the types of each column. In each iteration a single field is tested for its type. All three types (number, integer, string) are tested for the field, one of them should work. This way, it takes up to three times the number of...