crystal report sql expression field example

DevExpress report is really powerful, a variety of tricks, dazzling. This time use Xtrareport Development Report, many questions in the official document does not have the detailed explanation, hereby records. 1. The Formattingrules attribute in Xtrareport is a condition (Condition) that can only return a bool value, not the expression I want. 2, according to Xtr

Syntax for adding fields: alter table tablename add (column datatype [default value] [null/not null],...); Alter table tablename modify (column datatype [default value] [null/not null],...); Syntax for deleting a field: alter table tablename drop (column ); Multiple columns are separated by commas. Use alter table to add, delete, and modify a column. Create a table structure:Copy codeThe Code is as follows:Create table test1(Id varchar2 (20) not null

, positioning to the point of time, through the point of time please find the Minutes table inside the readings, to calculate, because the field is calculated, here with the dynamic SQLDECLARE @m1value decimal (22,6), @m0value decimal (22,6), @m59value decimal (22,6);Set @qzerosql = ' Select top 1 @m1value =m ' [email protected] + ', @m0value =m0, @m59value =m59 ' + ' from tblxxxx ' + 'where CONVERT (varchar), [date],120] [email protected] and DATEPAR

nulls, if NULL is not allowed, but no default value has been added, the insert will fail without a column insertion, and SQL Server defaults to insert and null inserts for columns that are not displayed. The last point is mainly related to the comparison of null values. In our impression, is it null,is not NULL comparison, or with =,If you forget this option, it is recommended to use is NULL to determine NULL, is not NULL to determine non-null. Fir

Code example for extracting information such as database table name and field name using SQL This article describes how to use SQL statements to extract the instance code of table names and field names of all tables in the database. The test is conducted in SQLserver. The sp

I heard that Ms SQL 2005 with the report function, so I tested a bit, but also relatively easy to use, so I recorded a stored procedure to write a report example. Since there is no voice in the test process, I am here to explain. The stored procedures used are as follows (in the video I finally changed the stored proc

Problem Description:Oracle uses PL/SQL developer to export data to CSV format, VARCHAR2 Type field if the value (for example, 3307830000004059) is too long, the CSV file is represented in scientific notation, even if the column is selected, click Data--. > columns, fixed width, column data format select text, and the last one will still be set to 0.Workaround:Ora

A few days ago, my colleague asked me how to convert a field value to a column. I wrote a simple Demo to share it. The Code is as follows: -- create a test table and add Test Data createtable # temp (amoney, bvarchar (10) * insertinto # temp (a, B) values () insert A few days ago, a colleague asked me how to convert a field value to a column. I wrote a simple Demo to share it. The Code is as follows: -- cre

MySQL's self-add statement everyone should be familiar and very simple Copy Code code as follows: Update ' info ' Set ' comments ' = ' comments ' +1 WHERE ' id ' = 32 That's OK, but sometimes we'll be involved in subtraction, For example: The number of comments on the article, after deleting or locking a comment, requires a total comment on the article minus one Comments smallint (5) Unsigned article Comments total Statistics

SELECT * FROM (select T2.cadastralno parcelid,t1.pkid taxpayerid,t2.taxtype taxtype,t1.booktype Taxpayertype,T2.cadastralno Parcelcadastralno,t2.landuser Parcellanduser,t1.payername TaxpayerpayernameFrom Grid_sysdb.bss_taxpayers t1,grid_sysdb.bbs_parcel t2,grid_sysdb.djsw_tddjxx T3where T3.nsrdzdah = T1.pkid and t1.payername = T2.landuser)where (Parcelid,taxpayerid) not in (select P.parcelid,p.taxpayerid from Bss_parceltaxpayerrel p)Not in multiple fieldsOracle