-- single line comment
/* multi line comment */
Data types
| Type
|
min
|
max
|
comment
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| boolean
|
|
|
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| char(n)
|
|
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| varchar(n)
|
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| text
|
|
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| smallint
|
-32768
|
32767
|
|
| int
|
|
|
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| serial
|
|
|
(~auto_increment in mysql)
|
| float(n)
|
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| real / float8
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| numeric(p,s)
|
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| date
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| time
|
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| timestamp
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| timestamptz
|
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| interval
|
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| json
|
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| jsonb
|
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| uuid
|
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| + special
|
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|
Operators
|
|
|
Example
|
| =
|
equal
|
WHERE "time" = '2024-09-28 15:46:09.602492+00'
|
| <>, !=
|
not equal
|
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| <, >
|
less/greater than
|
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| <=, >=
|
less/greater than or equal
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| IS NULL
|
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| LIKE
|
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WHERE "time
|
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_ = single char
|
escaped = \_
|
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% = 0 or more chars
|
escaped = \%
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| ILIKE
|
case-insensitive LIKE
|
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| IN
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WHERE name IN ('Joe', 'Bob', 'Jane')
|
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WHERE user_id IN (SELECT user_id FROM orders)
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| ~
|
regex
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| !~
|
not regex
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| AND
|
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| OR
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| BETWEEN
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|
Databases
SELECT datname FROM pg_database
WHERE datistemplate = false;
Tables
SELECT table_catalog,table_schema,table_name FROM information_schema.tables
WHERE table_type = 'BASE TABLE' AND table_schema = 'public'
ORDER BY table_type, table_name
SELECT
nspname || '.' || relname AS "Object Name", relkind As "Object Type",
pg_size_pretty(pg_relation_size(C.oid)) AS "size"
FROM pg_class C
LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
WHERE nspname NOT IN ('pg_catalog', 'information_schema')
ORDER BY pg_relation_size(C.oid) DESC
LIMIT 20;
List all users
SELECT * FROM pg_user;
Links