crystal reports sql expression

C_ParentName, C_Code as C_ParentCode From CategorySelf c where C_Code like '2/% 'and C_Level The query result is the same as the preceding one. We can see that, sometimes, a good table structure design is very important. You are invited to complete the sharing at a.m. on June 23. Some people are very concerned about performance issues. No tests have been performed. A million-Level Test Report will be attached later. However, two points of understanding about the invitation month are m

expression (CTE). Using CTE can make the SQL statement maintainability, CTE is much more efficient than table variables.The syntax of CTE is as follows:Copy codeThe Code is as follows:[WITH Expression_name [(column_name [, n])]AS(CTE_query_definition) Now we use CTE to solve the above problem. The SQL statement is as follows:Copy codeThe Code is as follows:WithC

Oracle version: 10.2.0.1 OS: Linux 64-bit Regular expressions are used in SQL: Select count (*) From t Where regexp_like (T. Note, '^ (. | +) * (\ (either \) +', 'I ') The first execution can be performed, the second execution reports ORA-7445, session interruption. The records in the trace file are as follows: Exception signal: 11 (SIGSEGV), Code: 1 (address not mapped to object), ADDR: 0x5e, PC: [0x2a