Difference between revisions of "SQL"
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;.schema <tablename> | ;.schema <tablename> | ||
:Show the create statement for the table | :Show the create statement for the table | ||
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+ | ;Dump to standard output | ||
+ | <syntaxhighlight lang=bash> | ||
+ | echo "sqlstatement;"|sqllite <DBfile>.DB | ||
+ | </syntaxhighlight> |
Revision as of 22:21, 17 July 2019
Structured Query Language for databases.
- LPAD(<value>,<no>,<char>)
- Left fill <value> with <char> until <no> length
- concat(<value1>,<value2>)
- Concatenate 2 strings
SubQuery
The example shows how subquery results can be handled as a table, aliasing of field and tablenames, a case statement and inner joins. Example query
select int_id,
'fieldspec1' as Alias,
(Case
When table1.field1 > 1 And table2.field1 = 'value' Then x
When table1.field1 > 2 And table2.field1 = 'value' Then y
Else z
End) As CaseResult,
SubQuery.fieldname as VALUE_SUBQUERY
from
(Select distinct fieldname,
from table1 tabalias
Inner Join table2 on table2field = tabalias.field1
Inner Join table3 on table3field = table2field
And table3filed = avalue
Where (field1 > 1value And (field2 = 1 And field3 = 'value'))
or (field1 > avalue )
) as SubQuery
Inner Join jointable1 On jointable1.field2 = subquery.field1
Where subquery.field1 <> jointable1.field1
SQLite
Simple but complete DBMS. No server, just a file that is queried. Often used as embedded database in small devices.
The current implementation used is sqlite3.
- sqlite3 <DBfile>
- Open the database file and enter the sqlite program. Help is available.
sqlite>.help
- .databases
- Show the databases in the file
In below statements specification is optional if there is only 1 database or table.
- .tables <database>
- Show the tables in the database
- .schema <tablename>
- Show the create statement for the table
- Dump to standard output
echo "sqlstatement;"|sqllite <DBfile>.DB