order by clause in sql

Tags: SQL ORDER BYSo far, we have learned how to capture data from a table with the two commands of SELECT and WHERE . However, we have not yet mentioned how this information should be arranged. This is actually a very important question. In fact, we often need to be able to make a systematic display of the captured data. This may be by small toward large (ascending) or by large toward small (descending). I

SELECT * from EVENT WHERE eventId in (443,419,431,440,420,414,509) ORDER by INSTR (', 443,419,431,440,420,414,509, ', CONCAT (', ', eventId, ', '))Oracle notation :Select name from order where Oderid in(111,222,333,444,555,666)Order by InStr (' 111,222,333,444,555,666 ', OrderID)SQL Server Syntax:Select * FROM Product

Select prod_name, prod_pricefrom productswhere vend_id = 'l01' or vend_id = 'brs01' and prod_price> = 10; Prod_name prod_price -----------------------------Fish bean bag toy 3.4900 bird bean bag toy 3.4900 rabbit bean bag toy 3.490018 inch teddy bear 11.9900 Raggedy Ann 4.9900 Look at the results above. Four of the rows returned have prices less than $10-so, obviusly, the rows were not filtered as intended. Why did this happen? The answer is the

Label:The SQL code is not processed in coding order, but in the following order:(8)SELECT(9)DISTINCTSelect_list> (1) fromLeft_table> (3)Join_type>JOINRight_table> (2) onJoin_condition> (4)WHEREWhere_condition> (5)GROUP byGroup_by_list> (6) with{CUBE|ROLLUP} (7) havingHaving_condition> (Ten)ORDER byOrder_by_list>

index is deleted. Doing so causes an unnecessary rebuild of the nonclustered index. The conversion of a table from a heap table to a clustered index table always results in the rebuilding of a nonclustered index, because the content of a nonclustered indexed bookmark changes from the row number to the key of the clustered index. Do Plan Your Index defragmenting and rebuilding Based upon Usage If an index is frequently scanned, the external fragmentation of the index is important, which can have

It is often necessary to be able to make a systematic display of the captured data. This may be by small toward large (ascending) or by large toward small (descending). In this case, we can use order by as an order to achieve our purpose.The syntax for ORDER by IS as follows: SELECT from [WHERE "condition"] ORDER by [A

(p_order_type_id = ooh.order_type_i d) Order_type, Hca.account_number customer_number, Hp.party_name customer_name, Ooh.attribute1 cux_order _number, Ool.line_number | | '. ' | | Ool.shipment_number Line_num, msi.concatenated_segments item_name, Msi.description item_dsp, ool.ordered _quantity, Ool.unit_selling_price, Cux_om_pub.get_adjusted_amt (p_oe_line_id = ool.line_id, P_version_no = ' apply_rebate_accrue ') * ool.ordered_quantity LINE_ACCRUE_MT, cux_om_pub

The syntax of the IF statement for PL/SQL is defined as follows:IF condition Then{...} statements ...}elsif condition Then{...} statements ...}ELSE{...} statements ...}END IF;Because PL/SQL is not like a high-level language, there are no curly braces, and if statements contains more than one operation, will these operations be performed?Here is a function to do an experiment to verify the

(1) Sort controlSelect table_name, tablespace_name from User_tables ORDER BY table_name $ordertype $Where the user input OrderType ASC, DESC. On this keyword, use the $ordertype: sqlkeyword$ replacement $ OrderType $.(2) Sort fieldsSQL statement metadata. IF The SQL statement, there is user input metadata. Table name, field names and so on.For example the following SQL:Select table_name, tablespace_name fro

Label: Let's take a look at the backup sequence Novice--1, tower Build environment (generate test data and backup files)/* Test environment: Microsoft SQL Server R2 (RTM)-10.50.1600.1 (X64) APR 2 15:48:46 Copyright (c) Microsoft Corporat Ion Enterprise Edition (64-bit) on Windows NT 6.1 2. View Backup file RelationshipsSELECT A.database_name, Case a.type if ' D ' then ' the ' when ' I ' then ' differential ' when ' L ' then ' Log '

Label:The order of the data cannot be guaranteed because the optimizer may choose to parallel processing or scan the data in a multi-file case without looking in order. The only order by is to ensure the sequence.The process of parallel processing results in inconsistent sequencing, no parallelism on the single core, and dual cores, which may use parallel opportu

Label:SQL is a declarative language, and its greatest feature in comparison to other languages is the order of execution-not executed in a syntactic order. So a lot of programs ape see SQL Headache, I was the same before, and later saw an article suddenly enlightened-address. Understanding the execution order of