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Monthly Archives: December 2020

Format SQL or PL/SQL directly in Oracle database

Posted on December 23, 2020 by Sayan Malakshinov Posted in java, oracle, PL/SQL, SQL, SQL*Plus, SQL*PLus tips 3,051 Page views Leave a comment

Obviously we can format/beautify SQL or PL/SQL code using external tools, but sometimes it would be more convenient to format it directly in database, for example if we want to see few different sql_text’s from v$sqlarea. And thanks to Oracle SqlCL and Oracle SQL Developer, we can easily use oracle.dbtools.app.Format function from their Java library dbtools-common.jar, so if you use SqlCL or SQL Developer, you can use the same formatting options.

1. load appropriate java library into Oracle

You may have already installed SQLDeveloper or SqlCL on your database server, just check $ORACLE_HOME/sqldeveloper or $ORACLE_HOME/sqcl directories. If – not, you need to download appropriate SqlCL version that matches your java version in Oracle. For 12.2 – 19.8 you can download latest SqlCL 20.3. In fact we need just dbtools-common.jar from lib directory. I put it into $ORACLE_HOME/sqlcl/lib directory on the server and load it using loadjava:

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beautifier pl/sql formatter sql format SQL*Plus sqlformatter

Funny friday Oracle SQL quiz: query running N seconds

Posted on December 11, 2020 by Sayan Malakshinov Posted in curious, Funny, oracle, quiz, SQL 1,780 Page views Leave a comment

Write a pure SQL query with PL/SQL that stop after :N seconds, where :N is a bind variable.

My solution

[sourcecode language=”sql”]
with v(start_hsecs, delta, flag) as (
select
hsecs as start_hsecs, 0 as delta, 1 as flag
from v$timer
union all
select
v.start_hsecs,
(t.hsecs-v.start_hsecs)/100 as delta,
case when (t.hsecs-v.start_hsecs)/100 > :N /* seconds */ then v.flag*-1 else v.flag+1 end as flag
from v, v$timer t
where v.flag>0 and t.hsecs>=v.start_hsecs
)
select delta
from v
where 0>flag
/
–end
[/sourcecode]

[collapse]
SQL> var N number
SQL> exec :N := 3 /* seconds */;

PL/SQL procedure successfully completed.

SQL> select...

     DELTA
----------
      3.01

1 row selected.

Elapsed: 00:00:03.01

Another my solution using sys.standard.current_timestamp, so some internal pl/sql…:

select count(*) from dual 
connect by sys.standard.current_timestamp - current_timestamp <= interval'3'second;
funny quiz sql
photo Sayan Malakshinov

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