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Concatenate multiple rows of records in the same column in Oracle into a string [SQL] -- raw data -- a 111 -- B 222 -- a 333 -- a 444 -- B 555 -- final result -- a 111*333*444 SELECT L4.L _ TIME, MAX (SUBSTR (L4. group CONTENT, 2) final field value FROM (SELECT L3.L _ TIME, SYS_CONNECT_BY_PATH (L3.L _ CONTENT ,'*') AS
Concatenate the values of multiple queried columns into a string bitsCN.com using SQL. Concatenate the values of multiple queried columns into a string using SQL. MySQL: [SQL]
this statement is as follows:NO VALUE NAME RNFIRST RNNEXT1 d Test 4 1 21 c Test 3 2 31 B Test 2 3 41 a Test 1 4 NULL2 e test 5 5 NULL4g Testing 7 6 74 f Test 6 7 NULL 3. Finally, sys_connect_by_path function and start recursion are performed.Sys_connect_by_path (Value ,';')Start with rnNext is nullConnect by rnNext = prior rnFirstThis probably means that from the record whose rnNext is null, recursive search,If the rnFirst field of the previous record is equal to the rnNext field of the current
Oracle 10g obtains the result set of merging values in column B based on the same value in column a. oracle 10g obtains the same value according to Column, obtains the result set that combines
Tags: mysq share picture BSP City DIV SQL statement alt space OralceEffect:Oralce notation:Select Wm_concat (a.title) as Citys from Tmpcity ASQL Server notation:Select Stuff ((select ', ' +a.title from tmpcity A for XML PATH (') '), 1, 1, ") as CitysMySQL notation:Select Group_concat (a.title) as citys from Tmpcity A; --The default comma-delimitedSelect Group_concat (A.title SEPARATOR ") as Citys from Tmpcity A; --separated by a spaceSQL statement Mer
Label:Use scenario: Convert a column value to a comma-delimited string Example: For example, query all of the table space below, now to get all the table space with a comma-delimited string (such as the time of Rman duplicate skip tablespace) SQL>Select from v$tablespace; NAME ------------------------------ SYSTEM sysaux ctxd apps_ Ts_tx_data apps_ts_tx_idx owapub apps_ts_queues ODM OLAP apps_ts_tools APPS
Oracle Advanced SQL (4) -- SQL column and column conversion topic 2, oracle -- SQL [Previous topic] column-and-
Sometimes the following error occurs when you create a SQL Server job with an SQL statement: MSG 515, Level 16, State 2, procedure sp_add_job, line 137th Cannot insert value NULL into column ' owner_sid ', table ' msdb.dbo.sysjobs '; column does not allow null values
Tags: des style blog color io ar for data divmerge the column value table structure with the following data: ID value----- ------1AA1BB2AAA2BBB2CCC needs to get results: ID values------ -----------1AA,BB2AAA,BBB,CCC namely: Group by ID, sum of Value (string addition)1The old workaround (can only be resolved with functions in SQL Server 2000.) )--1creating a handl
When SQL queries data, a ranking column is added after sorting by a column. If the column values to be ranked are the same, the ranking column array is 9, 9, 8, 7, 7, and 6. The added ranking
=f.id) Xiaoshou from Fruit F XML typeIn the pivot column switch example above, you already know what types of queries need to be queried, including in (), assuming that if you don't know what the values are, how do you build the query? Another clause in the pivot operation XML can be used to resolve this problem. This clause allows you to create an output that performs a pivot operation in XML format, where
table, these rows are out of sync with the index. However, even if the column has a high selectivity, high clustering_factor and small avg_row_len also indicate that the column values are randomly distributed in the table, and obtaining these rows requires additional I/O. In this case, an index range scan can result in a large amount of unnecessary I/O (see Fig
Column value selection, Set cluster, and column chartRemember, the optimizer understands many important features of column data in a table. The most notable is the column value selectivity and the clustering factor of the column.For example, we can see a query that uses column
The analysis of CLOB type processing in the original Broken Sword ice-oraclePrevious analysis: ORA-01461: Can only bind a long value to insert a long columnMost recently, for the Clob field, when inserting data, the number of bytes in the character (one half-width character, one byte, one full-width character, two bytes) between 2000-4000 times is wrong (ORA-01461: You can only insert a Long value assignment for a long column). After constantly lookin
In Oracle 10 Gb, there is a single-Table query SQL statement, which does not have a where clause, but simply calculates the maximum and minimum values of a column at the same time.According to our understanding, it should undergo a full index scan, but it does. The data size of a single table is a little large, and the
,description'); Query data, you can see the col2 bit null when the default conversion used Default_on_null_seq. Nextval's SELECT * from T2; Example: A simple example of master-slave tableCREATE SEQUENCE Master_seq; CREATE SEQUENCE Detail_seq; CREATE TABLE Master ( ID number DEFAULT Master_seq. Nextval, Description VARCHAR2 (30) ); CREATE TABLE Detail ( ID number DEFAULT Detail_seq. Nextval, master_id number DEFAULT master_seq. Currval, Description VARCHAR2 (30) ); INSERT into Master (descriptio
(ID int,name varchar (), Q1 int, Q2 int, Q3 int, Q4 int); INSERT into Fruit values (1, ' Apple ', 1000,2000,3300 INSERT into Fruit values (2, ' orange ', 3000,3000,3200,1500), insert into Fruit values (3, ' banana ', 2500,3500,2200,2500); INSERT into Fruit values (4, ' grapes ', 1500,2500,1200,3500); select * FROM Fru
Tags: Oracle replication column values different databasesRequirement Description: Adds a field to a table that already exists in the test environment and manually adds data to this column of a subset of the data in the table, and now wants to be able to add the field to the formal environment and copy the
The most common way to merge column values is to write a custom function to do this, and here's another way. You can use the for XML Path in SQL Server to merge column values, and you can use Wm_concat or Listagg in Oracle. Prep
The most common way to merge column values is to write a custom function to the fact that this is the other way around.The merge column values in SQL Server can use the for Xml Path, which in Oracle can use Wm_concat or Listagg.Pr
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